问题 解答题
解方程.
1-
3
4
x=
3
5

3
4
1
5
=20:x
x
3.5
=
x-16
1.5

x+(3x-16)÷25%=10(x+1)
答案

(1)1-

3
4
X=
3
5

1-

3
4
X+
3
4
X=
3
5
+
3
4
X

3
5
+
3
4
X-
3
5
=1-
3
5

3
4
3
4
=
2
5
÷
3
4

X=

8
15

(2)

3
4
1
5
=20:X

3
4
X=
1
5
×20

3
4
3
4
=4÷
3
4

X=

16
3

(3)

x
3.5
=
x-16
1.5

3.5(X-16)=1.5X,

3.5X-56=1.5X

3.5X-56+56=1.5X+56

3.5X-1.5X=56

2X=56

X=28,

(4)X+(3X-16)÷25%=10(X+1)

X+(3X-16)×4=10X+10

X+3X×4-16×4=10X+10

13X-64=10X+10

13X-64+64=10X+10+64

13X=10X+74

13X-10X=10X+74-10X

3X=74

X=

74
3

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