证明:若a,b,c和d是任意客体,则[tex=11.429x1.357]M9HCZQy5NCm4vjyl3sEnngW7x6rap+SHw4vFrxwAqnapVwypfonKBLujpERB8cuv[/tex]当且仅当a=c和b=d。
举一反三
- 证明:若[tex=2.286x1.214]/YPHwK1EAx3tt4NkddZ/SQ==[/tex]和[tex=0.571x1.0]TcM6B5Wrs5vy9dWrxRPSdg==[/tex]是任意客体,则[tex=11.429x1.357]M9HCZQy5NCm4vjyl3sEnngW7x6rap+SHw4vFrxwAqnapVwypfonKBLujpERB8cuv[/tex]当且仅当[tex=1.786x0.786]7EinzWj6V2RwOSXTPruQoQ==[/tex]和[tex=1.786x1.0]eQWX+g7mu+EpMYvDb4eOfA==[/tex]
- 对任意对象[tex=3.286x1.214]S1r9TKg/0CvhrA1vxbq3mQ==[/tex]证明:[tex=11.429x1.357]6a6z8YTwRPVWJA7kp0hJkO1oaCaKovkywjLdf+ZeKi/J1ePmBwTKyl6FxXJOhRZ7[/tex]当且仅当[tex=1.786x0.786]wXjKGLJAiZXJ3pTvfsXMXw==[/tex]且 [tex=1.786x1.0]RtpbN5xDaWWRNMMqkfsXkw==[/tex]
- 假设“☆”是一种新的运算,若3☆2=3×4,6☆3=6×7×8,x☆4=840(x>0),那么x等于: A: 2 B: 3 C: 4 D: 5 E: 6 F: 7 G: 8 H: 9
- set1 = {x for x in range(10)} print(set1) 以上代码的运行结果为? A: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} B: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10} C: {1, 2, 3, 4, 5, 6, 7, 8, 9} D: {1, 2, 3, 4, 5, 6, 7, 8, 9,10}
- 已知向量a= (-3 ,2 ) , b=(x, -4) , 若a//b,则x=( ) A: 4 B: 5 C: 6 D: 7