去括号并合并同类项(1)3x-2(x+7)+2(2x+5) （2）（4x-3y)-[-（3y-x)+（x-y)]-5x

快啊

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解
3x-2(x+7)+2(2x+5)
=3x-2x-14+4x+10
=(3x-2x+4x)+(10-14)
=5x-4

(4x-3y)-[-(3y-x)+(x-y)]-5x
=4x-3y-[-3y+x+x-y]-5x
=4x-3y+4y-2x-5x
=(4x-2x-5x)+(4y-3y)
=-3x+y

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