题目内容
下面各题怎样简便就怎样算 97.5-(0.6+9.4÷0.2) | 3.2×12.5×2.5 | 24×(
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考点:小数四则混合运算,运算定律与简便运算,分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算除法,再算加法,最后算减法;
(2)根据乘法交换律和结合律进行简算;
(3)根据乘法分配律进行简算;
(4)根据加法交换律和结合律进行简算;
(5)先算减法,再算除法,最后算乘法;
(6)根据乘法分配律进行简算.
(2)根据乘法交换律和结合律进行简算;
(3)根据乘法分配律进行简算;
(4)根据加法交换律和结合律进行简算;
(5)先算减法,再算除法,最后算乘法;
(6)根据乘法分配律进行简算.
解答:
解:(1)97.5-(0.6+9.4÷0.2)
=97.5-(0.6+47)
=97.5-47.6
=49.9;
(2)3.2×12.5×2.5
=(4×0.8)×12.5×2.5
=(4×2.5)×(0.8×12.5)
=10×10
=100;
(3)24×(
-
+
)
=24×
-24×
+24×
=16-6+10
=10+10
=20;
(4)
-
+
-
=(
+
)-(
+
)
=
-1
=
;
(5)
×[2÷(
-
)]
=
×[2÷
]
=
×16
=
;
(6)
×
-
÷11
=
×
-
×
=(
-
)×
=
×
=
.
=97.5-(0.6+47)
=97.5-47.6
=49.9;
(2)3.2×12.5×2.5
=(4×0.8)×12.5×2.5
=(4×2.5)×(0.8×12.5)
=10×10
=100;
(3)24×(
2 |
3 |
1 |
4 |
5 |
12 |
=24×
2 |
3 |
1 |
4 |
5 |
12 |
=16-6+10
=10+10
=20;
(4)
3 |
8 |
2 |
5 |
7 |
8 |
3 |
5 |
=(
3 |
8 |
7 |
8 |
2 |
5 |
3 |
5 |
=
5 |
4 |
=
1 |
4 |
(5)
5 |
6 |
7 |
8 |
3 |
4 |
=
5 |
6 |
1 |
8 |
=
5 |
6 |
=
40 |
3 |
(6)
5 |
8 |
1 |
11 |
1 |
4 |
=
5 |
8 |
1 |
11 |
1 |
4 |
1 |
11 |
=(
5 |
8 |
1 |
4 |
1 |
11 |
=
3 |
8 |
1 |
11 |
=
3 |
88 |
点评:考查了运算定律与简便运算,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简便计算.
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