X/3*0.5+(88-X)/4*0.7=15这个方程怎么解,

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X/3*0.5+(88-X)/4*0.7=15这个方程怎么解,X/3*0.5+(88-X)/4*0.7=15这个方程怎么解,X/3*0.5+(88-X)/4*0.7=15这个方程怎么解,两边乘以120

X/3*0.5+(88-X)/4*0.7=15这个方程怎么解,
X/3*0.5+(88-X)/4*0.7=15这个方程怎么解,

X/3*0.5+(88-X)/4*0.7=15这个方程怎么解,
两边乘以120得
20x+21(88-x)=1800
1848-x=1800
x=48

先都化为分数形式 x/6 + 7*(88-x)/40 =15
同时乘以最小公倍数120， 20x + 21*(88-x) =15*120
-x = 15*120-21*88 = 3*5*15*8 - 3*7*11*8 =3*8*(5*15 - 7*11) = 3*8*(-2)
x = 48

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