作业帮当n=-2,b=二分之一时 求5a²b-[2a²b-（ab²-2a²b)-4]-2ab²的值过程尽量写,写的优先采纳
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当n=-2,b=二分之一时 求5a²b-[2a²b-（ab²-2a²b)-4]-2ab²的值过程尽量写,写的优先采纳
当n=-2,b=二分之一时 求5a²b-[2a²b-（ab²-2a²b)-4]-2ab²的值
过程尽量写,写的优先采纳
当n=-2,b=二分之一时 求5a²b-[2a²b-（ab²-2a²b)-4]-2ab²的值过程尽量写,写的优先采纳
原式=5a²b-(2a²b-ab²+2a²b-4)-2ab²
=5a²b-(4a²b-ab²-4)-2ab²
=5a²b-4a²b+ab²+4-2ab²
=a²b-ab²+4
=4*1/2-(-2)*1/4+4
=13/2