问题 解答题
看谁算得都对
x+
7
9
x=1
1
3
x+25%x=0.375
2
3
x-
1
5
x=1.4
2
3
x-
3
8
x=
1
7
答案

(1)x+

7
9
x=1
1
3

1

7
9
x=1
1
3

1

7
9
x÷1
7
9
=1
1
3
÷1
7
9

x=

3
4

(2)x+25%x=0.375

1.25x=0.375

1.25x÷1.25=0.375÷1.25

x=0.3;

(3)

2
3
x-
1
5
x=1.4

7
15
x=1.4

7
15
7
15
=1.4÷
7
15

x=3;

(4)

2
3
x-
3
8
x=
1
7

7
24
x=
1
7

7
24
7
24
=
1
7
÷
7
24

x=

24
49

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