问题 解答题
求未知数x
x:
1
2
=
1
5
:8
(4+
1
5
)x=3.5×1.2.
答案

(1)x:

1
2
=
1
5
:8,

8x=

1
2
×
1
5

8x÷8=

1
10
÷8,

x=

1
80

(2)(4+

1
5
)x=3.5×1.2,

4.2x=4.2,

4.2x÷4.2=4.2÷4.2,

x=1.

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