题目内容
能简算的要简算 10×10.7-10÷62.5% |
99%×99+99% | ||||||||||||||||
4×8×1.25×25% | (
| ||||||||||||||||
|
| ||||||||||||||||
32.6×
|
465×
| ||||||||||||||||
|
|
分析:(1)、(5)先算乘法、除法,再算减法;
(2)、(4)、(6)、(7)、(9)、(10)运用乘法分配律简算;
(3)利用乘法交换律、结合律简算;
(8)把465看作464+1,利用乘法分配律简算.
(2)、(4)、(6)、(7)、(9)、(10)运用乘法分配律简算;
(3)利用乘法交换律、结合律简算;
(8)把465看作464+1,利用乘法分配律简算.
解答:解:(1)10×10.7-10÷62.5%,
=107-16,
=91;
(2)99%×99+99%,
=99%×(99+1),
=99%×100,
=99;
(3)4×8×1.25×25%,
=(4×25%)×(8×1.25),
=1×10,
=10;
(4)(
+
)×23+
,
=
×23+
×23+
,
=
+(
+
),
=
+1,
=1
;
(5)
×
-
÷
,
=
-
,
=
;
(6)
×
+
×
,
=
×(
+
),
=
;
(7)32.6×
+32.6×20%,
=32.6×(
+
),
=32.6;
(8)465×
,
=(464+1)×
,
=464×
+
,
=463
;
(9)
×
+
÷6,
=
×(
+
),
=
;
(10)
×
+
×
,
=
×(
+
),
=
.
=107-16,
=91;
(2)99%×99+99%,
=99%×(99+1),
=99%×100,
=99;
(3)4×8×1.25×25%,
=(4×25%)×(8×1.25),
=1×10,
=10;
(4)(
1 |
69 |
2 |
71 |
25 |
71 |
=
1 |
69 |
2 |
71 |
25 |
71 |
=
1 |
3 |
46 |
71 |
25 |
71 |
=
1 |
3 |
=1
1 |
3 |
(5)
8 |
15 |
3 |
4 |
1 |
6 |
1 |
2 |
=
2 |
5 |
1 |
3 |
=
1 |
15 |
(6)
5 |
4 |
5 |
6 |
1 |
6 |
5 |
4 |
=
5 |
4 |
5 |
6 |
1 |
6 |
=
5 |
4 |
(7)32.6×
4 |
5 |
=32.6×(
4 |
5 |
1 |
5 |
=32.6;
(8)465×
463 |
464 |
=(464+1)×
463 |
464 |
=464×
463 |
464 |
463 |
464 |
=463
463 |
464 |
(9)
5 |
7 |
1 |
6 |
2 |
7 |
=
1 |
6 |
5 |
7 |
2 |
7 |
=
1 |
6 |
(10)
1 |
8 |
3 |
4 |
1 |
8 |
1 |
4 |
=
1 |
8 |
3 |
4 |
1 |
4 |
=
1 |
8 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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