x分之120+1.2x分之180=27,解方程,

问题描述:

x分之120+1.2x分之180=27,解方程,

120/x+180/1.2x=27
(144+180)/1.2x=27
324=32.4x
x=10

120/x+180/(1.2x)=27
120/x+(180/1.2)*(1/x)=27
化简:120/x+150/x=27
根据分母相同,分子相加的原则,得
270/x=27
x=270/27
x=10

120/X+180/1.2X=27 左边等式先通分推导出 1440/12X+1800/12X=27 (1440+1800)/12X=27
3240/12X=27 3240=27*12X 3240=324X X=10