5x-9.8=4.7 解 5X-9.8+9.8=4.7+9.8 5X=14.5 5X/5=14.5/5 x=2.9 望楼主采纳
x*5-9.8=4.75*x=14.5x=2.9
(9.8+4.7)÷5=2.9
2.9