题目内容
(2012?宁德)
怎样算简便就怎样算. 32×
|
8-
|
〔1-(
| ||||||||||||||
(
|
101×92-92 | 420÷6÷7. |
分析:(1)(5)运用乘法分配律简算;
(2)根据减法的性质简算;
(3)先算小括号里面的加法,再算中括号里面的减法,最后算括号外的除法;
(4)同时运算两个小括号里面的减法和加法,再算括号外的除法;
(6)根据连续除以两个数,等于除以这两个数的积简算.
(2)根据减法的性质简算;
(3)先算小括号里面的加法,再算中括号里面的减法,最后算括号外的除法;
(4)同时运算两个小括号里面的减法和加法,再算括号外的除法;
(6)根据连续除以两个数,等于除以这两个数的积简算.
解答:解:(1)32×
+32×
,
=32×(
+
),
=32×1,
=32;
(2)8-
-5.8-
,
=(8-5.8)-(
+
),
=2.2-1,
=1.2;
(3)[1-(
+
)]÷
,
=[1-
]÷
,
=
÷
,
=2;
(4)(
-
)÷(
+
),
=
÷
,
=
;
(5)101×92-92,
=(101-1)×92,
=100×92,
=9200;
(6)420÷6÷7,
=420÷(6×7),
=420÷42,
=10.
5 |
7 |
2 |
7 |
=32×(
5 |
7 |
2 |
7 |
=32×1,
=32;
(2)8-
2 |
5 |
3 |
5 |
=(8-5.8)-(
2 |
5 |
3 |
5 |
=2.2-1,
=1.2;
(3)[1-(
1 |
5 |
3 |
10 |
1 |
4 |
=[1-
1 |
2 |
1 |
4 |
=
1 |
2 |
1 |
4 |
=2;
(4)(
2 |
3 |
7 |
12 |
2 |
7 |
1 |
8 |
=
1 |
12 |
23 |
56 |
=
14 |
69 |
(5)101×92-92,
=(101-1)×92,
=100×92,
=9200;
(6)420÷6÷7,
=420÷(6×7),
=420÷42,
=10.
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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