题目内容
3×
+2.7×25%
×11.6+18.4×
×
-60%×
×31+
×
+
÷
×38.
| 1 |
| 4 |
| 9 |
| 5 |
| 9 |
| 5 |
| 16 |
| 5 |
| 7 |
| 13 |
| 7 |
| 13 |
| 7 |
| 32 |
| 7 |
| 32 |
| 12 |
| 17 |
| 2 |
| 3 |
| 2 |
| 3 |
| 17 |
| 5 |
| 33 |
| 37 |
分析:(1)把百分数化为分数,运用乘法分配律简算;
(2)(3)(4)运用乘法分配律简算;
(5)把除法改为乘法,运用乘法分配律简算;
(6)把38看做37+1,运用乘法分配律简算.
(2)(3)(4)运用乘法分配律简算;
(5)把除法改为乘法,运用乘法分配律简算;
(6)把38看做37+1,运用乘法分配律简算.
解答:解:(1)3×
+2.7×25%
=3×
+2.7×
=(3+2.7)×
=5.7×
=
×
=
;
(2)
×11.6+18.4×
=
×(11.6+18.4)
=
×30
=54;
(3)
×
-60%×
=(
-60%)×
=(
-
)×
=
×
=
;
(4)
×31+
=
×(31+1)
=
×32
=7;
(5)
×
+
÷
=
×
+
×
=(
+
)×
=1×
=
;
(6)
×38
=
×(37+1)
=
×37+
=33+
=33
.
| 1 |
| 4 |
=3×
| 1 |
| 4 |
| 1 |
| 4 |
=(3+2.7)×
| 1 |
| 4 |
=5.7×
| 1 |
| 4 |
=
| 57 |
| 10 |
| 1 |
| 4 |
=
| 57 |
| 40 |
(2)
| 9 |
| 5 |
| 9 |
| 5 |
=
| 9 |
| 5 |
=
| 9 |
| 5 |
=54;
(3)
| 16 |
| 5 |
| 7 |
| 13 |
| 7 |
| 13 |
=(
| 16 |
| 5 |
| 7 |
| 13 |
=(
| 16 |
| 5 |
| 3 |
| 5 |
| 7 |
| 13 |
=
| 13 |
| 5 |
| 7 |
| 13 |
=
| 7 |
| 5 |
(4)
| 7 |
| 32 |
| 7 |
| 32 |
=
| 7 |
| 32 |
=
| 7 |
| 32 |
=7;
(5)
| 12 |
| 17 |
| 2 |
| 3 |
| 2 |
| 3 |
| 17 |
| 5 |
=
| 12 |
| 17 |
| 2 |
| 3 |
| 2 |
| 3 |
| 5 |
| 17 |
=(
| 12 |
| 17 |
| 5 |
| 17 |
| 2 |
| 3 |
=1×
| 2 |
| 3 |
=
| 2 |
| 3 |
(6)
| 33 |
| 37 |
=
| 33 |
| 37 |
=
| 33 |
| 37 |
| 33 |
| 37 |
=33+
| 33 |
| 37 |
=33
| 33 |
| 37 |
点评:此题主要考查了乘法分配律的灵活运用.
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