题目内容
脱式计算.(能用简便方法计算的要用简便方法计算)
(1)13.6×3-40.6÷2 | (2)99×0.75+
|
(3)(
| ||||||||||
(4)121×100
|
(5)15÷3-7×(
|
(6)24
|
(1)13.6×3-40.6÷2,
=40.8-20.3,
=20.5;
(2)99×0.75+
×99,
=99×(0.75+0.25),
=99×1,
=99;
(3)(
-
)×24,
=
×24-
×24,
=20-15,
=5;
(4)121×100
,
=121×(100+
),
=121×100+121×
,
=12100+1,
=12101;
(5)15÷3-7×(
+
),
=15÷3-7×
,
=5-1
,
=3
;
(6)24
÷6-
,
=4
-
,
=4.
=40.8-20.3,
=20.5;
(2)99×0.75+
1 |
4 |
=99×(0.75+0.25),
=99×1,
=99;
(3)(
5 |
6 |
5 |
8 |
=
5 |
6 |
5 |
8 |
=20-15,
=5;
(4)121×100
1 |
121 |
=121×(100+
1 |
121 |
=121×100+121×
1 |
121 |
=12100+1,
=12101;
(5)15÷3-7×(
1 |
7 |
1 |
21 |
=15÷3-7×
4 |
21 |
=5-1
1 |
3 |
=3
2 |
3 |
(6)24
6 |
23 |
1 |
23 |
=4
1 |
23 |
1 |
23 |
=4.
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