问题 解答题
3
4
=
5
6

2
3
x+
3
4
x=
1
6

0.8x-1.5×4=18.
答案

(1)

3
4
=
5
6

3
4
×
3
4
=
5
6
×
3
4

x=

5
8

(2)

2
3
x+
3
4
x=
1
6

17
12
x=
1
6

17
12
12
17
=
1
6
×
12
17

x=

2
17

(3)0.8x-1.5×4=18,

0.8x-6=18,

0.8x-6+6=18+6,

0.8x=24,

0.8x÷0.8=24÷0.8,

x=30.

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