Question

已知：x=五又七分之四,y=四又七分之三,求代数式[(-3-1/2)(x+y)]^3 * (x-y) * [-2(x-y

Answer 1

x+y=10

x-y=8/7

原式=-7³/8*(x+y)³*(x-y)*4(x+y)²(x-u)²

=-343/2*(x+y)^5*(x-y)³

=-343/2*10^5*512/343

=-25600000