(a-b)x+(a+b)y=2(a²-b²) (a+b)x+(a-b)y=2(a²+b²) 解方程组

问题描述:

(a-b)x+(a+b)y=2(a²-b²) (a+b)x+(a-b)y=2(a²+b²) 解方程组

(a-b)x+(a+b)y=2(a²-b²) .(1)(a+b)x+(a-b)y=2(a²+b²) .(2)(1)+(2)得:2ax+2ay=4a^2 .(3)(2)-(1)得:2bx-2by=4b^2 .(4)化简得:x+y=2a .(5)x-y=2b .(6)(5)+(6)得:2x=2...