x+2x+(x-3)怎么.算
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x+2x+(x-3)怎么.算
x+2x+(x-3)怎么.算
x+2x+(x-3)怎么.算
4x-3
=【1+2】x+x-3=【1+2+1】x-3=4x-3
=3x+x-3=4x-3
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