题目内容
简算
4.5×25%+1.3×
+2.2×0.25
5.02-1.37-2.63
×40-
÷
.
4.5×25%+1.3×
| 1 |
| 4 |
5.02-1.37-2.63
| 7 |
| 16 |
| 5 |
| 16 |
| 1 |
| 40 |
分析:(1)把25%和0.25化成分数然后利用乘法分配律简算;
(2)利用减去两个数等于减去两个数的和,据此简算;
(2)把÷
化成×40,然后利用乘法分配律简算.
(2)利用减去两个数等于减去两个数的和,据此简算;
(2)把÷
| 1 |
| 40 |
解答:解:4.5×25%+1.3×
+2.2×0.25,
=(4.5+1.3+2.2)×
,
=8×
,
=2;
5.02-1.37-2.63,
=5.02-(1.37+2.63),
=5.02-4,
=1.02;
×40-
÷
,
=(
-
)×40,
=
×40,
=5.
| 1 |
| 4 |
=(4.5+1.3+2.2)×
| 1 |
| 4 |
=8×
| 1 |
| 4 |
=2;
5.02-1.37-2.63,
=5.02-(1.37+2.63),
=5.02-4,
=1.02;
| 7 |
| 16 |
| 5 |
| 16 |
| 1 |
| 40 |
=(
| 7 |
| 16 |
| 5 |
| 16 |
=
| 1 |
| 8 |
=5.
点评:本题主要利用乘法分配律和利用减去两个数等于减去两个数的和进行简算.
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