问题 解答题
(1)x+40%x=98(2)2.5:x=0.4:0.2.
答案

(1)x+40%x=98,

(1+40%)x=98,

1.4x=98,

1.4x÷1.4=98÷1.4,

x=70;

(2)2.5:x=0.4:0.2,

0.4x=2.5×0.2,

0.4x=0.5,

0.4x÷0.4=0.5÷0.4,

x=1.25.

单项选择题
单项选择题