题目内容

1
4
×125×
1
125
×8
1
2
+
1
3
+
1
6
×24
3
7
×(
4
5
-
2
3
)÷
3
15
3
1
8
÷
5
7
+3
1
8
÷
2
7
7
5
6
+8.9+2
1
6
+6.1
0.36×101
20-(5.6+4.8)÷1.3 3.2×(2.15+1.95÷6.5)
4
5
+
1
4
)÷
7
3
+
9
10
36×(
1
4
+
1
6
-
1
3
分析:本题据四则混合运算法则计算即可:先算乘除,再算加减,有括号的要先算括号里面的.同时要认真分析式中数据,能简算的要简算.
解答:
解:①
1
4
×125×
1
125
×8
=(
1
4
×8)×(
1
125
×125),
=2×1,
=1;②
1
2
+
1
3
+
1
6
×24
=
1
2
+
1
3
+4,
=4
5
6


3
7
×(
4
5
-
2
3
)÷
3
15

=
3
7
×
2
15
×
15
3

=
2
7
;④3
1
8
÷
5
7
+3
1
8
÷
2
7

=
25
8
×
7
5
+
25
8
×
7
2

=
35
8
+
175
16

=
245
16


⑤7
5
6
+8.9+2
1
6
+6.1
=(7
5
6
+2
1
6
)+(8.9+6.1),
=10+15,
=15;

⑥0.36×101
=0.36×100+0.36,
=36+0.36,
=36.36;

⑦20-(5.6+4.8)÷1.3
=20-10.4÷1.3,
=20-8,
=12;

⑧3.2×(2.15+1.95÷6.5)
=3.2×(2.15+0.3),
=3.2×2.45,
=7.84;

⑨(
4
5
+
1
4
)÷
7
3
+
9
10

=
21
20
×
3
7
+
9
10

=
9
20
+
9
10

=
27
20

⑩36×(
1
4
+
1
6
-
1
3

=36×
1
4
+36×
1
6
-36×
1
3

=9+6-12,
=3.
点评:完成此类题目要细心分析数据,然后据计算法则和运算定律完成.
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