Question

计算:

(1)3x²y-3xy²-xy²+x²y;

(2)4(a-2b+1)-3(-4a+b-5).

Answer

(1)x2y-xy2;(2) 16a-11b+19

【解析】

(1)直接合并同类项即可;

(2)先去括号,再合并同类项即可.

【解析】

(1)3x2y-3xy2-xy2+x2y=x2y-xy2.

(2)4(a-2b+1)-3(-4a+b-5)

=4a-8b+4+12a-3b+15

=16a-11b+19.