题目内容
计算下面各题,怎样简便就怎样算.
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36÷(
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分析:本题根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
(3)可根据乘法分配律计算.
(3)可根据乘法分配律计算.
解答:解:(1)
×
÷
,
=
×
,
=
;
(2)
÷
÷
=
×
×
,
=
;
(3)
×
+
÷
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)
+3÷
=
+3×
,
=
+2,
=2
;
(5)36÷(
÷
)
=36÷(
×10),
=36÷6,
=6;
(6)
÷
×
.
=
×
×
,
=
.
| 9 |
| 20 |
| 1 |
| 3 |
| 6 |
| 5 |
=
| 3 |
| 20 |
| 5 |
| 6 |
=
| 1 |
| 8 |
(2)
| 1 |
| 4 |
| 2 |
| 3 |
| 7 |
| 8 |
=
| 1 |
| 4 |
| 3 |
| 2 |
| 8 |
| 7 |
=
| 3 |
| 7 |
(3)
| 2 |
| 5 |
| 4 |
| 7 |
| 3 |
| 5 |
| 7 |
| 4 |
=
| 2 |
| 5 |
| 4 |
| 7 |
| 3 |
| 5 |
| 4 |
| 7 |
=(
| 2 |
| 5 |
| 3 |
| 5 |
| 4 |
| 7 |
=1×
| 4 |
| 7 |
=
| 4 |
| 7 |
(4)
| 1 |
| 3 |
| 3 |
| 2 |
=
| 1 |
| 3 |
| 2 |
| 3 |
=
| 1 |
| 3 |
=2
| 1 |
| 3 |
(5)36÷(
| 3 |
| 5 |
| 1 |
| 10 |
=36÷(
| 3 |
| 5 |
=36÷6,
=6;
(6)
| 2 |
| 5 |
| 8 |
| 15 |
| 1 |
| 10 |
=
| 2 |
| 5 |
| 15 |
| 8 |
| 1 |
| 10 |
=
| 3 |
| 40 |
点评:完成本题要细心,注意通分约分.
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