题目内容
能简算的要简算.
|
(
|
99×
| ||||||||||||||
|
(
|
|
分析:(1)(2)(3)(5)(6)根据乘法分配律进行计算;
(4)根据乘法交换律及结合律计算.
(4)根据乘法交换律及结合律计算.
解答:解:(1)
-
×
=
×(1-
)
=
×
=
;
(2)(
+
)×32
=
×32+
×32
=24+20
=44;
(3)99×
=(98+1)×
=98×
+
=5+
=5
;
(4)
×
×13×11
=(
×11)×(
×13)
=10×1
=10;
(5)(
+
)×
=
×
+
×
=2
+1
=3
;
(6)
×21+28×
=
×(21+28)
=
×49
=13.
| 4 |
| 5 |
| 4 |
| 5 |
| 5 |
| 6 |
=
| 4 |
| 5 |
| 5 |
| 6 |
=
| 4 |
| 5 |
| 1 |
| 6 |
=
| 2 |
| 15 |
(2)(
| 3 |
| 4 |
| 5 |
| 8 |
=
| 3 |
| 4 |
| 5 |
| 8 |
=24+20
=44;
(3)99×
| 5 |
| 98 |
=(98+1)×
| 5 |
| 98 |
=98×
| 5 |
| 98 |
| 5 |
| 98 |
=5+
| 5 |
| 98 |
=5
| 5 |
| 98 |
(4)
| 10 |
| 11 |
| 1 |
| 13 |
=(
| 10 |
| 11 |
| 1 |
| 13 |
=10×1
=10;
(5)(
| 4 |
| 5 |
| 3 |
| 10 |
| 10 |
| 3 |
=
| 4 |
| 5 |
| 10 |
| 3 |
| 3 |
| 10 |
| 10 |
| 3 |
=2
| 2 |
| 3 |
=3
| 2 |
| 3 |
(6)
| 13 |
| 49 |
| 13 |
| 49 |
=
| 13 |
| 49 |
=
| 13 |
| 49 |
=13.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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