题目内容
| 用自己喜欢的方法计算. 196÷49×503 |
| (
| ||||||||||||||||
|
| 99×99
|
考点:整数四则混合运算,运算定律与简便运算,分数的四则混合运算
专题:运算顺序及法则
分析:(1)按照从左到右顺序计算解答,
(2)运用加法交换律和结合律解答,
(3)运用乘法分配律解答,
(4)化
=
+
,
=
+
,
=
+
,
=
+
,再运用加法交换律和结合律解答.
(5)按照先算乘法,再算加法顺序计算解答,
(6)先化99
=100-
,再运用乘法分配律解答.
(2)运用加法交换律和结合律解答,
(3)运用乘法分配律解答,
(4)化
| 5 |
| 6 |
| 1 |
| 2 |
| 1 |
| 3 |
| 7 |
| 12 |
| 1 |
| 3 |
| 1 |
| 4 |
| 9 |
| 20 |
| 1 |
| 4 |
| 1 |
| 5 |
| 11 |
| 30 |
| 1 |
| 5 |
| 1 |
| 6 |
(5)按照先算乘法,再算加法顺序计算解答,
(6)先化99
| 98 |
| 99 |
| 1 |
| 99 |
解答:
解:(1)196÷49×503
=4×503
=2012;
(2)
+
+
+
=(
+
)+(
+
)
=1+1
=2;
(3)(
+
)×9×7
=
×9×7+
×9×7
=35+36
=71;
(4)
-
+
-
=
+
-
-
+
+
-
-
=
+(
-
)+(
-
)+(
-
)-
=
-
=
;
(5)
+
×
=
+
=
;
(6)99×99
=99×(100-
)
=99×100-99×
=9900-1
=9899.
=4×503
=2012;
(2)
| 3 |
| 8 |
| 16 |
| 19 |
| 5 |
| 8 |
| 3 |
| 19 |
=(
| 3 |
| 8 |
| 5 |
| 8 |
| 16 |
| 19 |
| 3 |
| 19 |
=1+1
=2;
(3)(
| 5 |
| 9 |
| 4 |
| 7 |
=
| 5 |
| 9 |
| 4 |
| 7 |
=35+36
=71;
(4)
| 5 |
| 6 |
| 7 |
| 12 |
| 9 |
| 20 |
| 11 |
| 30 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 6 |
=
| 1 |
| 2 |
| 1 |
| 6 |
=
| 1 |
| 3 |
(5)
| 7 |
| 8 |
| 1 |
| 8 |
| 8 |
| 9 |
=
| 7 |
| 8 |
| 1 |
| 9 |
=
| 71 |
| 72 |
(6)99×99
| 98 |
| 99 |
=99×(100-
| 1 |
| 99 |
=99×100-99×
| 1 |
| 99 |
=9900-1
=9899.
点评:本题主要考查学生依据四则运算计算方法以及正确运用简便方法解决问题的能力.
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