题目内容
计算下面各题.
42.5-700÷14×0.25
99×
-
×4 (
+
)÷
+
(10-0.5)÷1.9
+
÷
.
42.5-700÷14×0.25
99×
| 13 |
| 95 |
| 13 |
| 95 |
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
(10-0.5)÷1.9
| 5 |
| 8 |
| 3 |
| 8 |
| 9 |
| 16 |
分析:(1)先算除法,再算乘法,最后算减法.
(2)根据乘法分配律进行计算.
(3)先算括号里面的,再算除法,最后算加法.
(4)先算括号里面的,再算除法.
(5)先算除法,再算加法.
(2)根据乘法分配律进行计算.
(3)先算括号里面的,再算除法,最后算加法.
(4)先算括号里面的,再算除法.
(5)先算除法,再算加法.
解答:解:(1)42.5-700÷14×0.25
=42.5-50×0.25
=42.5-12.5
=30;
(2)99×
-
×4
=(99-4)×
=95×
=13;
(3)(
+
)÷
+
=
×
+
=
+
=
;
(4)(10-0.5)÷1.9
=9.5÷1.9
=5;
(5)
+
÷
=
+
=
.
=42.5-50×0.25
=42.5-12.5
=30;
(2)99×
| 13 |
| 95 |
| 13 |
| 95 |
=(99-4)×
| 13 |
| 95 |
=95×
| 13 |
| 95 |
=13;
(3)(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
=
| 21 |
| 20 |
| 3 |
| 7 |
| 7 |
| 10 |
=
| 9 |
| 20 |
| 7 |
| 10 |
=
| 23 |
| 20 |
(4)(10-0.5)÷1.9
=9.5÷1.9
=5;
(5)
| 5 |
| 8 |
| 3 |
| 8 |
| 9 |
| 16 |
=
| 5 |
| 8 |
| 2 |
| 3 |
=
| 31 |
| 24 |
点评:本题主要考查了学生的四则混合运算的计算能力,及在计算中根据题目特点进行简便运算的能力.
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