Question

3道初一整式若一个多项式与3x²+2y²的和事x²+xy-½y²,

Answer 1

（1）设这个多项式为Y

Y+3x^2+2y^2=x^2+xy-1/2y^

Y=-2x^2- 3/2y^2

(2)一样设Y

Y- 1/2ab-3b^2=a^2+ab+b^2

Y=a^2+3/2ab+4b^2

（3）设Y

2x^2-2x+4-Y=1/2x-2

-Y=3/2x-6-2x^2

Y=-3/2x+y+2x^2