题目内容
选择合适的方法计算下面各题:
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302×15-6950÷50. |
分析:(1)根据乘法分配律进行计算;
(2)根据乘法分配律进行计算;
(3)先算除法,再根据连减的性质进行计算;
(4)先算乘法和除法,再算减法.
(2)根据乘法分配律进行计算;
(3)先算除法,再根据连减的性质进行计算;
(4)先算乘法和除法,再算减法.
解答:解:
(1)
×0.25+
÷4-
,
=
×
+
×
-
,
=(
+
-1)×
,
=0×
,
=0;
(2)
×0.375-
÷
,
=
×0.375-
×0.375,
=(
-
)×0.375,
=1×0.375,
=0.375;
(3)
-
÷
-
,
=
-
-
,
=
-(
+
),
=
-1,
=
;
(4)302×15-6950÷50,
=4530-139,
=4391.
(1)
1 |
9 |
8 |
9 |
1 |
4 |
=
1 |
9 |
1 |
4 |
8 |
9 |
1 |
4 |
1 |
4 |
=(
1 |
9 |
8 |
9 |
1 |
4 |
=0×
1 |
4 |
=0;
(2)
11 |
7 |
4 |
7 |
8 |
3 |
=
11 |
7 |
4 |
7 |
=(
11 |
7 |
4 |
7 |
=1×0.375,
=0.375;
(3)
7 |
4 |
5 |
6 |
5 |
4 |
1 |
3 |
=
7 |
4 |
2 |
3 |
1 |
3 |
=
7 |
4 |
2 |
3 |
1 |
3 |
=
7 |
4 |
=
3 |
4 |
(4)302×15-6950÷50,
=4530-139,
=4391.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.

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选择合适的方法计算下面各题:
![]() ![]() ![]() | ![]() ![]() ![]() |
![]() ![]() ![]() ![]() | 302×15-6950÷50. |