题目内容
脱式计算.
8.82×15-100 | 15.8-
|
21.6-0.8×4÷0.8×4 | ||||||||
3
|
2.5×4.4 | (1.5+2
|
分析:(1)根据小数的四则混合运算进行计算即可得到答案;
(2)可先计算15.8与14.2的和,再减去
与
的和,结果不变;
(3)按照小数的四则混合运算进行计算即可;
(4)可将3.6转换成分数即3
再乘以1,最后利用乘法分配律进行计算;
(5)可将4.4改写成4加0.4,再利用分数的分配律进行计算比较简便;
(6)按照分数和小数的四则混合运算进行计算即可.
(2)可先计算15.8与14.2的和,再减去
7 |
18 |
11 |
18 |
(3)按照小数的四则混合运算进行计算即可;
(4)可将3.6转换成分数即3
3 |
5 |
(5)可将4.4改写成4加0.4,再利用分数的分配律进行计算比较简便;
(6)按照分数和小数的四则混合运算进行计算即可.
解答:解:(1)8.82×15-100
=132.3-100
=32.3;
(2)15.8-
+14.2-
=(15.8+14.2)-(
+
)
=30-1
=29;
(3)21.6-0.8×4÷0.8×4
=21.6-3.2÷0.8×4
=21.6-4×4
=21.6-16
=5.6;
(4)3
×3.7+3.6+5.3×3
=3
×3.7+3
×1+5.3×3
=3
×(3.7+1+5.3)
=3
×10
=36;
(5)2.5×4.4
=2.5×(4+0.4)
=2.5×4+2.5×0.4
=10+1
=11;
(6)(1.5+2
)÷3.75-
=
÷3.75-
=
×
-
=
-
=
.
=132.3-100
=32.3;
(2)15.8-
7 |
18 |
11 |
18 |
=(15.8+14.2)-(
7 |
18 |
11 |
18 |
=30-1
=29;
(3)21.6-0.8×4÷0.8×4
=21.6-3.2÷0.8×4
=21.6-4×4
=21.6-16
=5.6;
(4)3
3 |
5 |
3 |
5 |
=3
3 |
5 |
3 |
5 |
3 |
5 |
=3
3 |
5 |
=3
3 |
5 |
=36;
(5)2.5×4.4
=2.5×(4+0.4)
=2.5×4+2.5×0.4
=10+1
=11;
(6)(1.5+2
2 |
3 |
2 |
3 |
=
25 |
6 |
2 |
3 |
=
25 |
6 |
4 |
15 |
2 |
3 |
=
10 |
9 |
2 |
3 |
=
4 |
9 |
点评:此题主要考查的是分数、小数的四则混合运算和简便运算.
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