80(x+5)=200(x-7)怎么解(写过程)请把过程写清楚 thank you very much
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80(x+5)=200(x-7)怎么解(写过程)请把过程写清楚 thank you very much
80(x+5)=200(x-7)怎么解(写过程)
请把过程写清楚 thank you very much
80(x+5)=200(x-7)怎么解(写过程)请把过程写清楚 thank you very much
80(x+5)=200(x-7)
乘法分配律
80x+400=200x-1400
200x-80x=400+1400
120x=1800
x=1800÷120
x=15
80(x+5)=200(x-7)
80x+400=200x-1400
80x-200x=-1400-400
-120x=-1800
x=-1800/-120
x=15
80(x+5)=200(x-7)
80X+400=200X-1400
1800=120X
X=15