1.2a+b=32/1a-b=2 2.y=2(x-1)3(x-y)=23.x+y=72(x+y)-y=10

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(已知A=4a²+5b B=3a²-2b
当a=-2b=-1时求2A-B的值)是这样的吗?
a=-2b=-1,即a=-1,b=1/2=0.5
此时A=6.5 ,B=2
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