解方程4x+0.4x=70.4

问题描述:

解方程4x+0.4x=70.4
还有3x+百分之90*4=9 12分之11x - 百分之120=6.5

4x+0.4x=70.4
4·4x=70.4
44x=704
x=704÷44
x=16
我再帮你解答下面的~还有呢???3x+百分之90*4=93x+18/5=93x=9-18/53x=27/5x=27/5÷3x=9/512分之11x - 百分之120=6.511/12x-6/5=13/2两边同乘以60得55x-72=39055x=390+7255x=462x=462÷55x=8·4