(2006?紹興)遞等式計算.(能簡算的要簡算,并寫出主要過程)
(1)305×10-10034÷29
(2)17
6
17
-6.25-3
3
4

(3)8.53×
3
8
+11.47÷2
2
3

(4)(0.9÷
3
5
+4
1
2
)÷1
2
3
+3
1
6

(5)
5
6
×[2
1
3
-(
1
3
+0.2)]÷
3
5
分析:(1)同時運算乘法和除法,再算減法;
(2)根據(jù)連續(xù)減去兩個數(shù)等于減去這兩個數(shù)的和簡算;
(3)先把除法變成乘法,再運用乘法分配律簡算;
(4)先算小括號里面的除法,再算小括號里面的加法,然后算括號外的除法,最后算括號外的加法;
(5)先算把中括號里面的計算根據(jù)減去兩個數(shù)的和,等于連續(xù)減去這兩個數(shù)簡算,再算括號外的乘法,最后算括號外的除法.
解答:解:(1)305×10-10034÷29,
=305×10-10034÷29,
=3050-346,
=2704;

(2)17
6
17
-6.25-3
3
4
,
=17
6
17
-(6.25+3.75),
=17
6
17
-10,
=7
6
17
;

(3)8.53×
3
8
+11.47÷2
2
3
,
=8.53×
3
8
+11.47×
3
8
,
=(8.53+11.47)×
3
8
,
=20×
3
8
,
=
15
2
;

(4)(0.9÷
3
5
+4
1
2
)÷1
2
3
+3
1
6
,
=(
3
2
+4
1
2
)÷1
2
3
+3
1
6
,
=6×
3
5
+3
1
6
,
=
18
5
+3
1
6
,
=6
23
30
;

(5)
5
6
×[2
1
3
-(
1
3
+0.2)]÷
3
5

=
5
6
×[2
1
3
-
1
3
-0.2]÷
3
5
,
=
5
6
×[2-0.2]÷
3
5
,
=
5
6
×1.8÷
3
5

=1.5×
5
3
,
=2.5.
點評:本題考查了四則混合運算,注意運算順序和運算法則,靈活運用所學的運算定律進行簡便計算.
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