问题 解答题
解方程.
(1)x:6=
2
5
(2)3.6x=1.8×3
(3)276×4=368x(4)
8
21
=
0.4
x
答案

(1)x:6=

2
5

5x=6×2,

5x÷5=12÷5,

x=2.4;

(2)3.6x=1.8×3,

3.6x=5.4,

3.6x÷3.6=5.4÷3.6,

x=1.5;

(3)276×4=368x,

1104=368x,

1104÷368=368x÷368,

x=3;

(4)

8
21
=
0.4
x

8x=21×0.4,

8x÷8=8.4÷8,

x=1.05.

单项选择题
单项选择题