题目内容
(10
|
3
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|
(1-
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|
|
分析:(1)根据四则运算的顺序,先计算小括号里的5
×0.6,再算小括号里的减法,再算括号外的10
÷0.35,最后算加法;
(2)把3
变成3.75,再利用乘法的分配律变成3.75×(5
+6
-2)计算;
(3)根据四则运算的顺序,乘法和除法同时计算,再算加法;
(4)把除以
变成乘8,再利用乘法的分配律计算;
(5)根据四则运算的顺序,先计算小括号里的10-3.5=6.5,化为
,再算乘法,最后算减法;
(6)先算小括号里的减法,中括号里从左到右依次计算,最后算括号外面的除法.
| 5 |
| 6 |
| 1 |
| 2 |
(2)把3
| 3 |
| 4 |
| 7 |
| 11 |
| 4 |
| 11 |
(3)根据四则运算的顺序,乘法和除法同时计算,再算加法;
(4)把除以
| 1 |
| 8 |
(5)根据四则运算的顺序,先计算小括号里的10-3.5=6.5,化为
| 13 |
| 2 |
(6)先算小括号里的减法,中括号里从左到右依次计算,最后算括号外面的除法.
解答:解:(1)(10
-5
×0.6)+10
÷0.35,
=(10.8-3.5)+30,
=7.3+30,
=37.3;
(2)3
×5
+3.75×6
-2×3.75,
=3.75×5
+3.75×6
-2×3.75,
=3.75×(5
+6
-2),
=3.75×10,
=37.5;
(3)
×
+2
÷1
,
=
+
,
=
;
(4)(1-
-
)÷
,
=(1-
-
)×8,
=1×8-
×8-
×8,
=8-
-
,
=
;
(5)
×(10-3.5)-
,
=
×
-
,
=
-
,
=
;
(6)
÷[2
÷(3
-
)×1
],
=
÷[2
÷
×
],
=
÷[
×
×
],
=
÷1,
=
.
| 4 |
| 5 |
| 5 |
| 6 |
| 1 |
| 2 |
=(10.8-3.5)+30,
=7.3+30,
=37.3;
(2)3
| 3 |
| 4 |
| 7 |
| 11 |
| 4 |
| 11 |
=3.75×5
| 7 |
| 11 |
| 4 |
| 11 |
=3.75×(5
| 7 |
| 11 |
| 4 |
| 11 |
=3.75×10,
=37.5;
(3)
| 5 |
| 8 |
| 4 |
| 5 |
| 2 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 32 |
| 15 |
=
| 79 |
| 30 |
(4)(1-
| 1 |
| 10 |
| 5 |
| 24 |
| 1 |
| 8 |
=(1-
| 1 |
| 10 |
| 1 |
| 24 |
=1×8-
| 1 |
| 10 |
| 5 |
| 24 |
=8-
| 4 |
| 5 |
| 5 |
| 3 |
=
| 83 |
| 15 |
(5)
| 5 |
| 6 |
| 2 |
| 3 |
=
| 5 |
| 6 |
| 13 |
| 2 |
| 2 |
| 3 |
=
| 65 |
| 12 |
| 8 |
| 12 |
=
| 19 |
| 4 |
(6)
| 1 |
| 8 |
| 4 |
| 9 |
| 2 |
| 5 |
| 11 |
| 15 |
| 1 |
| 11 |
=
| 1 |
| 8 |
| 4 |
| 9 |
| 8 |
| 3 |
| 12 |
| 11 |
=
| 1 |
| 8 |
| 22 |
| 9 |
| 3 |
| 8 |
| 12 |
| 11 |
=
| 1 |
| 8 |
=
| 1 |
| 8 |
点评: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律简便计算.
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