题目内容
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|
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13.96÷
|
76×
|
24×(
|
分析:(1)(3)(6)运用乘法分配律简算;
(2)先算小括号里面的减法,再算中括号里面的乘法,最后算括号外的除法;
(4)根据连续除以两个数等于除以这两个数的积来简算;
(5)把76分解成73+3,然后再用乘法分配律简算.
(2)先算小括号里面的减法,再算中括号里面的乘法,最后算括号外的除法;
(4)根据连续除以两个数等于除以这两个数的积来简算;
(5)把76分解成73+3,然后再用乘法分配律简算.
解答:解:(1)
×
+
×
,
=
×(
+
),
=
×2,
=
;
(2)
÷[(
-
)×
],
=
÷[
×
],
=
÷
,
=
;
(3)
×58+
×41+
,
=
×(58+41+1),
=0.125×100,
=12.5;
(4)13.96÷
÷6,
=13.96÷(
×6),
=13.96÷10,
=1.396;
(5)76×
,
=(73+3)×
,
=73×
+3×
,
=23+
,
=23
;
(6)24×(
+
+
),
=24×
+24×
+24×
,
=4+9+14,
=13+14,
=27.
| 2 |
| 9 |
| 3 |
| 5 |
| 2 |
| 9 |
| 7 |
| 5 |
=
| 2 |
| 9 |
| 3 |
| 5 |
| 7 |
| 5 |
=
| 2 |
| 9 |
=
| 4 |
| 9 |
(2)
| 4 |
| 5 |
| 5 |
| 8 |
| 1 |
| 2 |
| 5 |
| 8 |
=
| 4 |
| 5 |
| 1 |
| 8 |
| 5 |
| 8 |
=
| 4 |
| 5 |
| 5 |
| 64 |
=
| 256 |
| 25 |
(3)
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
=
| 1 |
| 8 |
=0.125×100,
=12.5;
(4)13.96÷
| 5 |
| 3 |
=13.96÷(
| 5 |
| 3 |
=13.96÷10,
=1.396;
(5)76×
| 23 |
| 73 |
=(73+3)×
| 23 |
| 73 |
=73×
| 23 |
| 73 |
| 23 |
| 73 |
=23+
| 69 |
| 73 |
=23
| 69 |
| 73 |
(6)24×(
| 1 |
| 6 |
| 3 |
| 8 |
| 7 |
| 12 |
=24×
| 1 |
| 6 |
| 3 |
| 8 |
| 7 |
| 12 |
=4+9+14,
=13+14,
=27.
点评:乘法分配律是常用的简便运算的方法,要熟练掌握,灵活运用.
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