(1)4(a+b)+2(a+b)-(a+b)
=(4+2-1)(a+b)
=5(a+b)
把(a+b)和(x+y)各看成一項,對下列各式合并同類項:(1)4(a+y)+2(a+b)-(a+b); (2)3(x+y)
把(a+b)和(x+y)各看成一項,對下列各式合并同類項:(1)4(a+y)+2(a+b)-(a+b); (2)3(x+y)
數(shù)學(xué)人氣:488 ℃時間:2020-07-09 07:35:40
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