2分之1x-1.5=11.5 4分之3x-(1-80%)x=4.95

问题描述:

2分之1x-1.5=11.5 4分之3x-(1-80%)x=4.95

1/2 x-1.5=11.5 ,1/2 x=11.5+1.5 ,x=13×2,x=26
3/4 x-(1-80%)x=4.95,3/4 x-20%x=4.95,0.75x-0.2x=4.95,0.55x=4.95
x=4.95÷0.55,x=9

x/2-1.5=11.5 解得:x=(11.5+1.5)*2=26
3x/4-(1-80%)x=4.95 解 3x/4-0.2x=4.95 (0.2又可以写成2/10=1/5) 通分后得11x/20=4.95
解得:x=90