题目内容
(2011?合川区模拟)
怎样简便怎样算 210-97+83 |
19.8-0.6×7 |
|
[7.6-(3.85+2.6)]×0.4 | |||||||||||||
(
|
(
|
2-2÷3+
|
分析:(1)(4)运用减法性质解答,
(2)(3)(7)依据四则运算计算方法,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的解答,
(5)先运用乘法分配律再运用加法结合律解答,
(6)运用乘法分配律解答.
(2)(3)(7)依据四则运算计算方法,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的解答,
(5)先运用乘法分配律再运用加法结合律解答,
(6)运用乘法分配律解答.
解答:解:(1)210-97+83,
=210-100+3+83,
=110+3+83,
=196;
(2)19.8-0.6×7,
=19.8-4.2,
=15.6;
(3)
+
×
,
=
+
,
=1
;
(4)[7.6-(3.85+2.6)]×0.4,
=[7.6-2.6-3.85]×0.4,
=[5-3.85]×0.4,
=1.15×0.4,
=0.46;
(5)(
+
)×8+
,
=
×8+
×8+
,
=5+(
+
),
=5+1,
=6;
(6)(
+
+
)×24,
=
×24+
×24+
×24,
=12+8+6,
=26;
(7)2-2÷3+
,
=1
+
,
=1
.
=210-100+3+83,
=110+3+83,
=196;
(2)19.8-0.6×7,
=19.8-4.2,
=15.6;
(3)
5 |
6 |
2 |
3 |
3 |
8 |
=
5 |
6 |
1 |
4 |
=1
1 |
12 |
(4)[7.6-(3.85+2.6)]×0.4,
=[7.6-2.6-3.85]×0.4,
=[5-3.85]×0.4,
=1.15×0.4,
=0.46;
(5)(
5 |
8 |
1 |
27 |
19 |
27 |
=
5 |
8 |
1 |
27 |
19 |
27 |
=5+(
8 |
27 |
19 |
27 |
=5+1,
=6;
(6)(
1 |
2 |
1 |
3 |
1 |
4 |
=
1 |
2 |
1 |
3 |
1 |
4 |
=12+8+6,
=26;
(7)2-2÷3+
1 |
3 |
=1
1 |
3 |
1 |
3 |
=1
2 |
3 |
点评:本题主要考查学生运用四则运算计算方法,以及正确运用简便算法的能力.
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