早教吧 育儿知识 作业答案 考试题库 百科 知识分享

化简:(1)[2b-3+2(a²-1)]-(4a²-3b²)(2)(3x²y-xy²)-3(x²y-2xy²)[2b²-3+2(a²-1)]-(4a²-3b²)

题目详情
化简:(1)[2b-3+2(a²-1)]-(4a²-3b²)
(2)(3x²y-xy²)-3(x²y-2xy²)
[2b²-3+2(a²-1)]-(4a²-3b²)
▼优质解答
答案和解析
化简:
(1)[2b-3+2(a²-1)]-(4a²-3b²)
=2b -3 +2a²-2 -4a²+3b²
=2b -5 -2a²+3b²
(2)(3x²y-xy²)-3(x²y-2xy²)
=3x²y-xy²-3x²y+6xy²
=-xy²+6xy²
= 5 xy²