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