Question

6(x的平方y-3x 0-2(x-2x的平方y)-2x(-10x),其中(x+2)的平方+2y+3的绝对值等于零

Answer 1

原式=6x²y-18x-2x+4x²y+20x²

=10x²y-20x+20x²

(x+2)²+|2y+3|=0

x+2=0,x=-2;2y+3=0,y=-3/2

10x²y-20x+20x²

=10×（-2）²×（-3/2）-20×（-2）+20×（-2）²

=-60+40+80

=60