题目内容
脱式计算(能简算的要简算)
+
÷
+
3.4×99+3.4
17.3×
+17.3÷5
7.8×6.4+0.78×36.
| 2 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 2 |
| 5 |
3.4×99+3.4
17.3×
| 4 |
| 5 |
7.8×6.4+0.78×36.
考点:分数的四则混合运算,小数四则混合运算
专题:运算顺序及法则
分析:(1)按照先算除法,再从左到右顺序计算解答,
(2)(3)(4)运用乘法分配律解答.
(2)(3)(4)运用乘法分配律解答.
解答:
解:(1)
+
÷
+
=
+1+
=1
;
(2)3.4×99+3.4
=3.4×(99+1)
=3.4×100
=340;
(3)17.3×
+17.3÷5
=17.3×(
+
)
=17.3×1
=17.3;
(4)7.8×6.4+0.78×36
=7.8×(6.4+3.6)
=7.8×10
=78.
| 2 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 2 |
| 5 |
=
| 2 |
| 5 |
| 2 |
| 5 |
=1
| 4 |
| 5 |
(2)3.4×99+3.4
=3.4×(99+1)
=3.4×100
=340;
(3)17.3×
| 4 |
| 5 |
=17.3×(
| 4 |
| 5 |
| 1 |
| 5 |
=17.3×1
=17.3;
(4)7.8×6.4+0.78×36
=7.8×(6.4+3.6)
=7.8×10
=78.
点评:(1)依据四则运算计算方法正确进行计算,(2)正确运用乘法分配律解决问题,是本题考查知识点.
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