去括号并合并同类项 m-2(3-2n) (8a-7b)-2(4a-5b) -(5x+y)-3(2x-3y)
问题描述:
去括号并合并同类项 m-2(3-2n) (8a-7b)-2(4a-5b) -(5x+y)-3(2x-3y)
答
去括号并合并同类项
m-2(3-2n)
=m-6+4n
=m+4n-6;
(8a-7b)-2(4a-5b)
=8a-7b-8a+10b
=3b;
5x+y)-3(2x-3y)
=5x+y-6x+9y
=-x+10y;
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