• 2022-06-19
    已知函数[tex=4.643x1.286]Q2e9U1XyxLBMsCFsg3Cd2w==[/tex]满足方程[tex=14.714x2.357]V9fVXReHUrcmKJSTnoNlS/YIutsDa3VyMHeW/Ozlvu6aCOCl9nJxBO5q2LZN+RPOxwUpvCHg4ldmvdd8Hcew28x9yb69jwKzmlGwbdtDDWUGw93MM62pkM2eAynmjk0N/sxrFZ2XYj0wg+7sbO85VWkIOu0u8hq23RoEcPxdGtbmSIVZzBIC+eurje1bwbcHiqIDmyQ3+hN4WEpSf6L3Tg==[/tex],(1)试选择参数[tex=0.643x1.286]vYiGJJ9TAtvnQmM1PsOB8g==[/tex],[tex=0.643x1.286]mI2l8V/Tmuo7C2MtPPAzQQ==[/tex],利用变换[tex=9.643x1.286]lG//pp3jkxJROCr2FFJb/VcM1cOO7R0vMtobdoLdeEi+vNdPAOxvQ6GzArfBWRPn[/tex]将原方程变形,使新方程中不出现一阶偏导数项;(2)再令[tex=4.071x1.286]/GQ8YWkvfBP7euDv9qzboA==[/tex],[tex=4.071x1.286]6B4xoPjdd1wVwLrSNH7srQ==[/tex],使新方程变换形式。
  • (1)[tex=12.143x2.071]V9fVXReHUrcmKJSTnoNlS+UeOa20fvyFPhqUlsVsppyQFPtiYC8br1NTiosrv29iKdO5zptJRMdcXICHUtLbLyiDo6hca7uEGaDVoC0xBUeheUlRIkvBYeb2/dWiGEJicsITSyXPl2nypCj36GArdErFcchwjbxf8J+V7P0Xhk0=[/tex][tex=10.929x2.357]y2yx1hr1i8nZfV3cK9Tdp6CVff1UswLG+lvRVSNSXAzn7fBQg/Z8B/BPkF+UtPxEoPGDbj7bh2FvUUHSVNR/1C6ZMMrz8/EEy/2pts710gA9x0gRxg4j5f5FmUXttDFw[/tex][tex=14.0x2.357]V9fVXReHUrcmKJSTnoNlS/YIutsDa3VyMHeW/Ozlvu58+tW0aR5aDhizBXJ/Y6lMR0nvhBBBefCbeYTonRTT6G2tKNedQeFwCVVJ3KueffHA+rn7EskrMSRxQ2jh/y8327CxDw8Yfmoetqqi3v0FxNyeiUczuYLp/CyhOnXXSVr7fOHvgGxMvBPnHt9uMup6HOWso/5/KgZpUE1+yaWEivz7C/MQOizPe3ppyO23zrU=[/tex][tex=9.5x2.357]lZA0BgvRYcTbHu5I7Nl86VHfMcd/zxMBHLOy4vesRdBIfr60+Hk2h4CuWSESLPn8IAesYz0swycG4GKeyx1+sjvbjaoYmpkmPRNurO21EddL51lzxyhHTbIP+lTUbtxx[/tex][tex=14.714x2.357]y2yx1hr1i8nZfV3cK9Tdp7Is4nrdKIFX7lAqD9C5goa+LmN5Nu58LPVtRZr2rk/45tEfS7KttaA29VF4++/icOcik3M7YWhHZtn2cHSYTyJnMZynxU2zf+BJJdHZ7RSgs8isHlFJXciybQgmelwKS8JBkQInCldcdUaX7yKGaTc+YUxvXrnnANOu132Bsg7R[/tex][tex=11.786x2.357]V9fVXReHUrcmKJSTnoNlSyYi8vg6emYnFh+Uj8NYiUlipU3WVhpRXxf+kljbjRJaB5XqJVAkqJE5Im+H8an6EkBcp4Wal92pf77xjeX8xGrnhF+ij+QVvQW6V2mTX7o4N3a0vlFClzAPP406j1ONKBgggTBfHHu90yjDSOAHiPE=[/tex][tex=16.643x2.357]V9fVXReHUrcmKJSTnoNlS/YIutsDa3VyMHeW/Ozlvu4aq6CaKLR1XAMcnM+seEJvw2QdX7djQ3rC85qVgeEMKPrfg/22KAxnwPZisZ5ZKoj8b6YzFuvpgDFfLFGFYVEwT1M4ecOh4D6rjZKgpVplIo5IdPJcnBwykYRyQmZZHTr+xrLaq9cY4+2Oq2nRd+OmTnhe0fFpbGVF+MM3+XuiVVH/MRjL44EMbYorYBE2BC0=[/tex],将②,③,④,⑤代入①消去[tex=2.929x1.286]flWHyuqbBhGmA12DrBb37aoFgIxxTDTHCDdG8Ib+fDKjIcNZb/TQ+LxiPcpDjXRm[/tex],得[tex=10.786x2.357]V9fVXReHUrcmKJSTnoNlS8wVW0hmdo+WdXu/l7hnSFAVSKYn3+zRUANYcfcTIBiokuAGqADTqjZsw0eJwvyBNCFFEohEL/kMBf9C+CdipZ6AauJrdC7gE7KWM8dQ4DKyVc1UFREkBv+mOEfpCib9ZbYd4awcxQdmrI7UTSw4gg0=[/tex][tex=6.357x2.214]fL1WOqGEo+kyoGeXfnV6F56Ra3nTeY7aJBFgIwwJ/62PL9HY534RtytmEfG8wHKHetBsjq0rkiMXN0kuvKyHCg==[/tex][tex=13.571x1.286]e00BQ/EytexKTgjk3Vq0v15oi1hI/9RzBapgpQE37d6LraIGRvbrMFB7zU2gM/WK7Ginh8RIz0M5SXPvOetptcbyfaoK1b5UQhdXarh86Mw=[/tex],由题意可知,应令[tex=4.643x1.286]Ts0mpRVUbhjkzMLlV6s6qFxbFhha/ee+ykpJCpRhtlI=[/tex],[tex=5.357x1.286]qtz9/uSz9omS1acA94hTfVo+VpyepAA0yumKMjmyAlw=[/tex],[tex=3.357x1.786]ob6KeRvS51VrLnEaPz1Izs5jR5ZL6L+vToUXke2zgHU=[/tex],[tex=2.643x1.786]/LY5b9Guka5u5/UtSMmgiRfGzXTY4cmeh7FUH46U84U=[/tex],故原方程变为[tex=7.5x2.357]V9fVXReHUrcmKJSTnoNlS8wVW0hmdo+WdXu/l7hnSFAVSKYn3+zRUANYcfcTIBiokuAGqADTqjZsw0eJwvyBNJ64wtNYQbKd3MIhvTmDA9EO41Y3EHbkFkMwE3kL6vMe[/tex](2)令[tex=4.071x1.286]/GQ8YWkvfBP7euDv9qzboA==[/tex],[tex=4.071x1.286]6B4xoPjdd1wVwLrSNH7srQ==[/tex],故[tex=6.429x2.214]V9fVXReHUrcmKJSTnoNlS4lM1uwJ+cflMIsIPBLC8LA980LpJH2GuKi1Ysgb8b2cj0jtGCrp8kWB1NrT4HX8sjtuwLPCwxwgLbrSe9uIBWMGAjxYJy4ZG5M51b9v/DrfwhrdH5/ivlUHKrxgJBHgOQ==[/tex],[tex=6.357x2.214]V9fVXReHUrcmKJSTnoNlSyfhmBMfMKhme1KIIsSt2Mur9Pbud9kIskvuBRQvtCAuvKuARBWsOgJ8uxhRmjqqOHYbHTr/mSchEuFVGJKptjUn4QBw/rWBMXlsH9iSjPqxo69IqdWlQrlV0z7MZYzPsg==[/tex],[tex=11.714x2.357]V9fVXReHUrcmKJSTnoNlS8wVW0hmdo+WdXu/l7hnSFDGnGBYZdiCQqEKe3fgQUo+t+peJbbvZKTqrs1koUDGBWa7RztrusekVQLbFdhGaIJFpgfJUQRIuFOCiffThlMnobniXUbdr2UAa7KP/WyfU0+6ZljflM1fd5rMx/JYAzHS8dJnlZZs6IeOh1HYbera275kyxVRTB5tIxA6+nJlwclIgwh5HghqRYzw8SV2WCA=[/tex],[tex=11.714x2.357]V9fVXReHUrcmKJSTnoNlS8wVW0hmdo+WdXu/l7hnSFDD0/akpU1HBys/+N5uvyXu6Nf5Qi9PQ6R6eu4Jf3iUAaaSzaxN3ER5D8GMgAcQxpWK7GEzM7hoCsvTCClcPlgc0mUix7DYTHpRqY0CbdvxYrfogIc2UV0YCRcrUWPcG68KBqZFD3N1UtoTfKcmQmGHtaxMkWRUpKvN26H4/UDqCAs516SSQoWAU1QbmHIHsNM=[/tex],代入⑥得[tex=4.143x2.357]V9fVXReHUrcmKJSTnoNlS8wVW0hmdo+WdXu/l7hnSFA6cIq44b7qGr64yHZpDXPZ7ylSU5RUazdDq21YG3GW1Q==[/tex]。

    举一反三

    内容

    • 0

      【阅读理解(选择)/完型填空】基于以下描述回答 1-2 题: 下表是 9 名评委对 10 名学生的毕业设计进行等级评定结果: 评委 A B C D E F G H I J 1 1 2 4 3 9 6 5 8 7 10 2 1 4 2 5 6 7 3 10 8 9 3 1 3 4 5 2 8 9 6 10 7 4 1 3 4 5 2 6 10 8 7 9 5 1 9 2 5 6 3 4 8 10 7 6 1 4 9 2 5 6 7 3 10 8 7 1 3 5 10 2 6 9 7 8 4 8 1 3 5 7 6 4 8 10 2 9 9 1 2 8 4 9 6 3 7 5 10

    • 1

      输出九九乘法表。 1*1=1 2*1=2 2*2=4 3*1=3 3*2=6 3*3=9 4*1=4 4*2=8 4*3=12 4*4=16 5*1=5 5*2=10 5*3=15 5*4=20 5*5=25 6*1=6 6*2=12 6*3=18 6*4=24 6*5=30 6*6=36 7*1=7 7*2=14 7*3=21 7*4=28 7*5=35 7*6=42 7*7=49 8*1=8 8*2=16 8*3=24 8*4=32 8*5=40 8*6=48 8*7=56 8*8=64 9*1=9

    • 2

      下面语句的输出结果是?range(len('HelloWorld')) A: [1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11] B: 11 C: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] D: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]

    • 3

      A=[1 2 3 4 5 6 7 8 9]A(5)=[]A=1 4 7 5 8 3 6 9

    • 4

      已知a=[1 2 3; 4 5 6; 7 8 9],执行命令:a([3,1],:)=a([1,3],:),a将变为( )。 A: [4 5 6;4 5 6;4 5 6] B: [7 8 9;4 5 6;1 2 3] C: [2 2 2;5 5 5;8 8 8] D: [3 2 1;6 5 4;9 8 7]