(X+3)/(X+19)=3/5怎么解(X+3)/(X+19)=3/5怎么解
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(X+3)/(X+19)=3/5怎么解(X+3)/(X+19)=3/5怎么解
(X+3)/(X+19)=3/5怎么解
(X+3)/(X+19)=3/5
怎么解
(X+3)/(X+19)=3/5怎么解(X+3)/(X+19)=3/5怎么解
变式 5*(X+3)=3*(X+19) 由乘法分配率 得 5x+15=3x+57
移项得2x=57-15=42 x=21
5x+15=3x+57
2x=42
x=21
可化为5*(X +3)=3*(X+19),去括号:5 X + 1 5 =3 X +5 7 .移项:2X=42.得X=21
交叉相乘,(X+3)*5=(X+19)*3
5X+15=3X+57
2X=42
X=21
交叉相乘得5(x+3)=3(x+19)
然后化简得5x+15=3x+57
移项得5x-3x=57-15 2x=42
得x=21
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