2a-2(5a-3b)+3(2a-b)=?
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![2a-2(5a-3b)+3(2a-b)=?](/uploads/image/z/6872556-12-6.jpg?t=2a-2%285a-3b%29%2B3%282a-b%29%3D%3F)
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2a-2(5a-3b)+3(2a-b)=?
2a-2(5a-3b)+3(2a-b)=?
2a-2(5a-3b)+3(2a-b)=?
原式=2a-10a+6b+6a-3b
=8a-10a+3b
=3b-2a
=2a-10a+6b+6a-3b=-2a+3b
-2a+3b
2a-2(5a-3b)+3(2a-b)
=2a-10a+6b+6a-3b
=(2a-10a+6a)+(6b-3b)
=-2a+3b
3b-2a