题目内容
(1)4
+4.5×2
+
÷
.
(2)解方程:
x=
.
| 1 |
| 2 |
| 7 |
| 8 |
| 1 |
| 8 |
| 2 |
| 9 |
(2)解方程:
| 2 |
| 3 |
| 7 |
| 5 |
考点:分数的四则混合运算,方程的解和解方程
专题:运算顺序及法则
分析:(1)此题通过数字变形,运用乘法分配律简算.
(2)根据等式的性质,两边同乘
即可.
(2)根据等式的性质,两边同乘
| 3 |
| 2 |
解答:
解:(1)4
+4.5×2
+
÷
=
+
×2
+
×
=
×(1+2
+
)
=
×4
=18
(2)
x=
x×
=
×
x=
| 1 |
| 2 |
| 7 |
| 8 |
| 1 |
| 8 |
| 2 |
| 9 |
=
| 9 |
| 2 |
| 9 |
| 2 |
| 7 |
| 8 |
| 1 |
| 8 |
| 9 |
| 2 |
=
| 9 |
| 2 |
| 7 |
| 8 |
| 1 |
| 8 |
=
| 9 |
| 2 |
=18
(2)
| 2 |
| 3 |
| 7 |
| 5 |
| 2 |
| 3 |
| 3 |
| 2 |
| 7 |
| 5 |
| 3 |
| 2 |
x=
| 21 |
| 10 |
点评:此题考查了分数的简便计算以及根据等式的性质解方程的能力.
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