题目内容
混合运算.(能简算的要简算)
(1)(1-
×
)×
(2)
÷
+
÷
(3)
÷[3.75×(1.2-
)]
(4)160.6×2
-0.6÷
.
(1)(1-
2 |
3 |
3 |
5 |
5 |
6 |
(2)
7 |
8 |
3 |
8 |
1 |
8 |
3 |
8 |
(3)
3 |
4 |
1 |
5 |
(4)160.6×2
3 |
4 |
4 |
11 |
考点:整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则
分析:(1)先算小括号里面的乘法,再算减法,最后算括号外面的乘法;
(2)根据乘法分配律进行简算;
(3)先算减法,再算乘法,最后算除法;
(4)根据乘法分配律进行简算.
(2)根据乘法分配律进行简算;
(3)先算减法,再算乘法,最后算除法;
(4)根据乘法分配律进行简算.
解答:
解:(1)(1-
×
)×
=(1-
)×
=
×
=
;
(2)
÷
+
÷
=
×
+
×
=(
+
)×
=1×
=
;
(3)
÷[3.75×(1.2-
)]
=
÷[3.75×1]
=
÷3.75
=0.2;
(4)160.6×2
-0.6÷
=160.6×
-0.6×
=(160.6-0.6)×
=160×
=440.
2 |
3 |
3 |
5 |
5 |
6 |
=(1-
2 |
5 |
5 |
6 |
=
3 |
5 |
5 |
6 |
=
1 |
2 |
(2)
7 |
8 |
3 |
8 |
1 |
8 |
3 |
8 |
=
7 |
8 |
8 |
3 |
1 |
8 |
8 |
3 |
=(
7 |
8 |
1 |
8 |
8 |
3 |
=1×
8 |
3 |
=
8 |
3 |
(3)
3 |
4 |
1 |
5 |
=
3 |
4 |
=
3 |
4 |
=0.2;
(4)160.6×2
3 |
4 |
4 |
11 |
=160.6×
11 |
4 |
11 |
4 |
=(160.6-0.6)×
11 |
4 |
=160×
11 |
4 |
=440.
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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