经常账户余额[tex=10.857x1.357]KF49Dz8ZL3Tmn7ENqmTIX6kXisyOLckdID72zhIinF4=[/tex]

已知一波动方程为[tex=10.857x1.357]EEI9uBE6YJ4pF+jt2e4FLHEi+2Es9nHTLDJGE3Y1Vi5sn5b9gS8XT7EMvcfXUyM/[/tex]求波长、频率、波速和周期

离散系统的特征方程如下,判断系统的稳定性。[br][/br][tex=10.857x1.357]+0fILA3pPCCV2ufmEvXu2lJJVl21bzHiuDxv6tyXTBs=[/tex]

已知向量[tex=10.857x1.357]EolO0XyNMh1KIF4MZk0SL3wU820FkNquqGTNelkhNs4=[/tex]求与[tex=2.286x1.143]RhYEee1Rd4zYOGbGTCGm7A==[/tex]同向的单位向量。

用卡诺图化简法化简以下逻辑函数:[tex=10.857x1.357]UDR5/nj+sfLP1Ud1IZaX1LhLHb/LTMRsg/St+bUJJ19tWxkJ5Z0dARHOGw7Yd3hsSEB2G2dR6OyVAPB8y1cv6Q==[/tex]

设[tex=17.214x1.357]aIiiiinHsOWz4jOQbxKJHfok4MY2t2SMj/QPTDTwyyM2cNr6d4y+Ix6LWAimDUM2eIl1fk+XuOPvr5tY4nRJ1A==[/tex]，且[tex=4.571x1.214]fsxlzawMcJwirPcXATzaoU6yrqq50MyliK5Q/9kyL1g=[/tex]。证明：[tex=10.857x1.357]lk4Xi0aA1J+5duSpczSEbvqGNE/SbojCoUwxyXsu28C5m3PqHiMeyMnTZOYCOpUi[/tex]

已知随机变量X,Y的方差均存在，则下列等式不一定成立的是 未知类型：{'options': ['[tex=10.857x1.357]oOmuZf6z+kFufYebyVd9XTyycP2XrAmw0surftiT7Cg7P2AjJrvgCAShHBUT2OZ39LEKRKWoLBnIdQ5DHbL3o+UOYFoL6oOmuyUCI0BzBZQ+Wtu32yTWSX0znptnFoF1[/tex][b]；[/b]', '[tex=18.0x1.286]H4Y9OE+Ro7ircD+oESNSDHz9My1VOLPNfOZnS+GRPoEvz/EuWiGgeHSgvvmr0V2x7eBwfe1FHJLV8/Jz5cHQGQQgS1zE/U19S6oKJ7yCB8E=[/tex]；', '[tex=17.857x1.5]oOmuZf6z+kFufYebyVd9XTyycP2XrAmw0surftiT7ChJtg0AGHIwGuVmL6dsNEe8G2Y9C5xw9QpHAyg2SKRInx3+8OJvAE7WnqJ/5VukYcj5sTKTcYwkaShKxxxC/uS9+TOL8+D6JDmcPSyYsQxgczsd+TcS7yOXC6krkWnZg4c=[/tex]', '[tex=18.857x1.286]fm2RjwvkYcnBKGckjEpJcZ2N6GdB1Y6WwdEVSaTf+VKaB4J8PGwsjcFPY8blSMVV[/tex]'], 'type': 102}

已知随机变量X,Y的方差均存在，则下列等式不一定成立的是 未知类型：{'options': ['[tex=10.857x1.357]oOmuZf6z+kFufYebyVd9XTyycP2XrAmw0surftiT7Cg7P2AjJrvgCAShHBUT2OZ39LEKRKWoLBnIdQ5DHbL3o+UOYFoL6oOmuyUCI0BzBZQ+Wtu32yTWSX0znptnFoF1[/tex][b]；[/b]', '[tex=18.0x1.286]H4Y9OE+Ro7ircD+oESNSDHz9My1VOLPNfOZnS+GRPoEvz/EuWiGgeHSgvvmr0V2x7eBwfe1FHJLV8/Jz5cHQGQQgS1zE/U19S6oKJ7yCB8E=[/tex]；', '[tex=17.857x1.5]oOmuZf6z+kFufYebyVd9XTyycP2XrAmw0surftiT7ChJtg0AGHIwGuVmL6dsNEe8G2Y9C5xw9QpHAyg2SKRInx3+8OJvAE7WnqJ/5VukYcj5sTKTcYwkaShKxxxC/uS9+TOL8+D6JDmcPSyYsQxgczsd+TcS7yOXC6krkWnZg4c=[/tex]', '[tex=18.857x1.286]fm2RjwvkYcnBKGckjEpJcZ2N6GdB1Y6WwdEVSaTf+VKaB4J8PGwsjcFPY8blSMVV[/tex]'], 'type': 102}

已知随机变量X,Y的方差均存在，则下列等式不一定成立的是 未知类型：{'options': ['[tex=10.857x1.357]oOmuZf6z+kFufYebyVd9XTyycP2XrAmw0surftiT7Cg7P2AjJrvgCAShHBUT2OZ39LEKRKWoLBnIdQ5DHbL3o+UOYFoL6oOmuyUCI0BzBZQ+Wtu32yTWSX0znptnFoF1[/tex][b]；[/b]', '[tex=18.0x1.286]H4Y9OE+Ro7ircD+oESNSDHz9My1VOLPNfOZnS+GRPoEvz/EuWiGgeHSgvvmr0V2x7eBwfe1FHJLV8/Jz5cHQGQQgS1zE/U19S6oKJ7yCB8E=[/tex]；', '[tex=17.857x1.5]oOmuZf6z+kFufYebyVd9XTyycP2XrAmw0surftiT7ChJtg0AGHIwGuVmL6dsNEe8G2Y9C5xw9QpHAyg2SKRInx3+8OJvAE7WnqJ/5VukYcj5sTKTcYwkaShKxxxC/uS9+TOL8+D6JDmcPSyYsQxgczsd+TcS7yOXC6krkWnZg4c=[/tex]', '[tex=18.857x1.286]fm2RjwvkYcnBKGckjEpJcZ2N6GdB1Y6WwdEVSaTf+VKaB4J8PGwsjcFPY8blSMVV[/tex]'], 'type': 102}

已知随机变量X,Y的方差均存在，则下列等式不一定成立的是 未知类型：{'options': ['[tex=10.857x1.357]oOmuZf6z+kFufYebyVd9XTyycP2XrAmw0surftiT7Cg7P2AjJrvgCAShHBUT2OZ39LEKRKWoLBnIdQ5DHbL3o+UOYFoL6oOmuyUCI0BzBZQ+Wtu32yTWSX0znptnFoF1[/tex][b]；[/b]', '[tex=18.0x1.286]H4Y9OE+Ro7ircD+oESNSDHz9My1VOLPNfOZnS+GRPoEvz/EuWiGgeHSgvvmr0V2x7eBwfe1FHJLV8/Jz5cHQGQQgS1zE/U19S6oKJ7yCB8E=[/tex]；', '[tex=17.857x1.5]oOmuZf6z+kFufYebyVd9XTyycP2XrAmw0surftiT7ChJtg0AGHIwGuVmL6dsNEe8G2Y9C5xw9QpHAyg2SKRInx3+8OJvAE7WnqJ/5VukYcj5sTKTcYwkaShKxxxC/uS9+TOL8+D6JDmcPSyYsQxgczsd+TcS7yOXC6krkWnZg4c=[/tex]', '[tex=18.857x1.286]fm2RjwvkYcnBKGckjEpJcZ2N6GdB1Y6WwdEVSaTf+VKaB4J8PGwsjcFPY8blSMVV[/tex]'], 'type': 102}