题目内容
解方程.
1-
x=
:
=20:x
=
x+(3x-16)÷25%=10(x+1)
1-
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
| 1 |
| 5 |
| x |
| 3.5 |
| x-16 |
| 1.5 |
x+(3x-16)÷25%=10(x+1)
(1)1-
X=
1-
X+
X=
+
X
+
X-
=1-
X÷
=
÷
X=
,
(2)
:
=20:X
X=
×20
X÷
=4÷
X=
;
(3)
=
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=
.
| 3 |
| 4 |
| 3 |
| 5 |
1-
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 4 |
| 2 |
| 5 |
| 3 |
| 4 |
X=
| 8 |
| 15 |
(2)
| 3 |
| 4 |
| 1 |
| 5 |
| 3 |
| 4 |
| 1 |
| 5 |
| 3 |
| 4 |
| 3 |
| 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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