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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