题目
求未知数x。
(1)
x: = :4
(2)
=
(3)
x+ x=42
(4)
1.25:0.25=
答案: x: 38 = 23 :4解:4x= 38 × 23 4x= 14 4x÷4= 14 ÷4 x= 116
x9 = 0.84.5解:4.5x=0.8×9 4.5x=7.24.5x÷4.5=7.2÷4.5 x=1.6
23 x+ 12 x=42 解: 76 x=42 76 x× 67=42× 67 x=36
1.25:0.25= x1.6 解:0.25x=1.25×1.6 0.25x=2 0.25x×4=2×4 x=8