题目
解方程。
(1)
9∶5=4.5∶x
(2)
=
(3)
∶x= ∶
(4)
5∶4=2.7∶x
答案: 9:5=4.5:x解:9x=5×4.5 9x=22.5 9x÷9=22.5÷9 x=2.5
28x=0.40.1解:0.4x=28×0.1 0.4x=2.80.4x÷0.4=2.8÷0.4 x=7
110 :x= 18 :14解:18x=110×14 18x=14018x÷18=140÷18 x=15
5:4=2.7:x解:5x=4×2.7 5x=10.8 5x÷5=10.8÷5 x=2.16