题目内容
用递等式计算,能简算的要简算 600-540÷30 |
| ||||||||
32×0.125×2.5 | (
|
分析:(1)先算除法,再算减法;
(2)利用乘法分配律简算;
(3)把32拆成8×4,利用乘法交换律与结合律简算;
(4)先算加法,再算除法.
(2)利用乘法分配律简算;
(3)把32拆成8×4,利用乘法交换律与结合律简算;
(4)先算加法,再算除法.
解答:解:(1)600-540÷30
=600-18
=582;
(2)
×
+
÷23+
=
×
+
×
+
=(
+
+1)×
=2×
=
;
(3)32×0.125×2.5
=8×0.125×(4×2.5)
=1×10
=10;
(4)(
+
)÷
=
×
=
.
=600-18
=582;
(2)
7 |
15 |
1 |
23 |
8 |
15 |
1 |
23 |
=
7 |
15 |
1 |
23 |
8 |
15 |
1 |
23 |
1 |
23 |
=(
7 |
15 |
8 |
15 |
1 |
23 |
=2×
1 |
23 |
=
2 |
23 |
(3)32×0.125×2.5
=8×0.125×(4×2.5)
=1×10
=10;
(4)(
1 |
4 |
1 |
3 |
2 |
3 |
=
7 |
12 |
3 |
2 |
=
7 |
8 |
点评:混合运算,主要抓住运算顺序,灵活运用运算定律简算.
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