2(x+y)-3(x-2y)3b-2c-(-4a+3(c+3b))+3c-4a
1个回答
2(x+y)-3(x-2y)
=2x+2y-3x+6y
=8y-x
3b-2c-(-4a+3(c+3b))+3c-4a
=3b-2c+4a-3c-9b+3c-4a
= -6b-2c
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