问题 解答题
解方程.
1
6
4
5
=x:48
(1+
2
3
)x=6.25
0.26×3-0.9x=6%
答案

(1)

1
6
4
5
=x:48,

4
5
x=
1
6
×48,

4
5
4
5
=
1
6
×48÷
4
5

x=10;

(2)(1+

2
3
)x=6.25,

5
3
x=6.25,

5
3
5
3
=6.25÷
5
3

x=3.75;

(3)0.26×3-0.9x=6%,

0.78-0.9x=6%,

0.78-0.9x+0.9x=6%+0.9x,

0.78=6%+0.9x,

0.78-6%=6%+0.9x-6%,

0.72=0.9x,

0.72÷0.9=0.9x÷0.9,

x=0.8.

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