题目内容
(2006?绍兴)递等式计算.(能简算的要简算,并写出主要过程)
(1)305×10-10034÷29
(2)17
-6.25-3
(3)8.53×
+11.47÷2
(4)(0.9÷
+4
)÷1
+3
(5)
×[2
-(
+0.2)]÷
.
(1)305×10-10034÷29
(2)17
6 |
17 |
3 |
4 |
(3)8.53×
3 |
8 |
2 |
3 |
(4)(0.9÷
3 |
5 |
1 |
2 |
2 |
3 |
1 |
6 |
(5)
5 |
6 |
1 |
3 |
1 |
3 |
3 |
5 |
分析:(1)同时运算乘法和除法,再算减法;
(2)根据连续减去两个数等于减去这两个数的和简算;
(3)先把除法变成乘法,再运用乘法分配律简算;
(4)先算小括号里面的除法,再算小括号里面的加法,然后算括号外的除法,最后算括号外的加法;
(5)先算把中括号里面的计算根据减去两个数的和,等于连续减去这两个数简算,再算括号外的乘法,最后算括号外的除法.
(2)根据连续减去两个数等于减去这两个数的和简算;
(3)先把除法变成乘法,再运用乘法分配律简算;
(4)先算小括号里面的除法,再算小括号里面的加法,然后算括号外的除法,最后算括号外的加法;
(5)先算把中括号里面的计算根据减去两个数的和,等于连续减去这两个数简算,再算括号外的乘法,最后算括号外的除法.
解答:解:(1)305×10-10034÷29,
=305×10-10034÷29,
=3050-346,
=2704;
(2)17
-6.25-3
,
=17
-(6.25+3.75),
=17
-10,
=7
;
(3)8.53×
+11.47÷2
,
=8.53×
+11.47×
,
=(8.53+11.47)×
,
=20×
,
=
;
(4)(0.9÷
+4
)÷1
+3
,
=(
+4
)÷1
+3
,
=6×
+3
,
=
+3
,
=6
;
(5)
×[2
-(
+0.2)]÷
,
=
×[2
-
-0.2]÷
,
=
×[2-0.2]÷
,
=
×1.8÷
,
=1.5×
,
=2.5.
=305×10-10034÷29,
=3050-346,
=2704;
(2)17
6 |
17 |
3 |
4 |
=17
6 |
17 |
=17
6 |
17 |
=7
6 |
17 |
(3)8.53×
3 |
8 |
2 |
3 |
=8.53×
3 |
8 |
3 |
8 |
=(8.53+11.47)×
3 |
8 |
=20×
3 |
8 |
=
15 |
2 |
(4)(0.9÷
3 |
5 |
1 |
2 |
2 |
3 |
1 |
6 |
=(
3 |
2 |
1 |
2 |
2 |
3 |
1 |
6 |
=6×
3 |
5 |
1 |
6 |
=
18 |
5 |
1 |
6 |
=6
23 |
30 |
(5)
5 |
6 |
1 |
3 |
1 |
3 |
3 |
5 |
=
5 |
6 |
1 |
3 |
1 |
3 |
3 |
5 |
=
5 |
6 |
3 |
5 |
=
5 |
6 |
3 |
5 |
=1.5×
5 |
3 |
=2.5.
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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