5×(x+0.7)=17.5解:x+0.7=17.5÷5x+0.7=3.5x=3.5-0.7x=2.8
5×(x+0.7)=17.5x+0.7=3.5x=2.8
x+0.7=17.5÷5x+0.7=3.5x=3.5-0.7x=2.8
5x+5×0.7=17.55x=14x=14/5=2.8
5x=14x=2.8