题目内容
能简算的要简算.
|
| 999×26+333×22 | ||||||||||||||
23.75-8.64-3.46 | 125×(8+0.8+0.08) | 9.9×8.6+0.86 |
考点:分数的简便计算,运算定律与简便运算,分数的四则混合运算
专题:运算定律及简算
分析:(1)运用加法交换律和结合律简算;
(2)先算小括号里面的减法,再算括号外的减法;
(3)先根据积不变规律,把999×26变成333×78,再运用乘法分配律简算;
(4)根据减法的性质简算;
(5)运用乘法分配律简算;
(6)先把0.86变成8.6×0.1,再运用乘法分配律简算.
(2)先算小括号里面的减法,再算括号外的减法;
(3)先根据积不变规律,把999×26变成333×78,再运用乘法分配律简算;
(4)根据减法的性质简算;
(5)运用乘法分配律简算;
(6)先把0.86变成8.6×0.1,再运用乘法分配律简算.
解答:
解:(1)
+
+
+
=(
+
)+(
+
)
=1+1
=2;
(2)
-(
-
)
=
-
=
;
(3)999×26+333×22
=(999÷3)×(26×3)+333×22
=333×78+333×22
=333×(78+22)
=333×100
=33300;
(4)23.75-8.64-3.46
=23.75-(8.64+3.46)
=23.75-12.1
=11.65;
(5)125×(8+0.8+0.08)
=125×8+125×0.8+125×0.08
=1000+100+10
=1110;
(6)9.9×8.6+0.86
=9.9×8.6+8.6×0.1
=(9.9+0.1)×8.6
=10×8.6
=86.
3 |
8 |
6 |
11 |
5 |
8 |
5 |
11 |
=(
3 |
8 |
5 |
8 |
6 |
11 |
5 |
11 |
=1+1
=2;
(2)
6 |
7 |
11 |
14 |
1 |
2 |
=
6 |
7 |
2 |
7 |
=
4 |
7 |
(3)999×26+333×22
=(999÷3)×(26×3)+333×22
=333×78+333×22
=333×(78+22)
=333×100
=33300;
(4)23.75-8.64-3.46
=23.75-(8.64+3.46)
=23.75-12.1
=11.65;
(5)125×(8+0.8+0.08)
=125×8+125×0.8+125×0.08
=1000+100+10
=1110;
(6)9.9×8.6+0.86
=9.9×8.6+8.6×0.1
=(9.9+0.1)×8.6
=10×8.6
=86.
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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