问题
计算题
计算:2(y﹣x)2﹣10(x﹣y)+6(x﹣y)﹣3(y﹣x)2
答案
解:2(y﹣x)2﹣10(x﹣y)+6(x﹣y)﹣3(y﹣x)2,
=(2﹣3)(y﹣x)2+(﹣10+6)(x﹣y),
=﹣(y﹣x)2﹣4(x﹣y),
=﹣x2+2xy﹣y2﹣4x+4y.
计算:2(y﹣x)2﹣10(x﹣y)+6(x﹣y)﹣3(y﹣x)2
解:2(y﹣x)2﹣10(x﹣y)+6(x﹣y)﹣3(y﹣x)2,
=(2﹣3)(y﹣x)2+(﹣10+6)(x﹣y),
=﹣(y﹣x)2﹣4(x﹣y),
=﹣x2+2xy﹣y2﹣4x+4y.