-(2a -b )+[a -(3a +4b ]
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-(2a-b)+[a-(3a+4b]-(2a-b)+[a-(3a+4b]-(2a-b)+[a-(3a+4b]原式=﹣(2a-b)+(a-3a-4b)=﹣2a+b+(-2a-4b)=﹣2a+b-2a-4
-(2a -b )+[a -(3a +4b ]
-(2a -b )+[a -(3a +4b ]
-(2a -b )+[a -(3a +4b ]
原式=﹣(2a -b )+(a -3a -4b )
=﹣2a+b+(-2a-4b)
=﹣2a+b-2a-4b
=﹣2a-2a+b-4b
=﹣4a﹣3b
2a(a-b)+4a(2a+3b)
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化简:3a-{-2b[a-(4a+3b)]}
2a+(4a-5b)-3(a-2b)
-(2a -b )+[a -(3a +4b ]
(2/3a)-[2/(a+b)]{[(a+b)/3a]-a-b}÷[(a-b)/b]