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(1)4a²+18ab-15a²+12ab=(2)5(xy-2z)-2(-xy+3z)=

题目详情
(1)4a²+18ab-15a²+12ab= (2)5(xy-2z)-2(-xy+3z)=
▼优质解答
答案和解析
(1)4a²+18ab-15a²+12ab=(4a²-15a²)+(18ab+12ab)=30ab-11a²
(2)5(xy-2z)-2(-xy+3z)= 5xy-10z+2xy-6z=7xy-16z