题目内容

6.42×1.01-6.42 80.7×8.7+8.07×13
3
5
×153-0.6×53
23.19+2.4+2.91+14.6 2.6×99+2.6 24×(
3
8
+
5
6
(
5
8
+
2
27
)×8+
11
27
1
2
÷[
2
3
×(
1
6
+
1
3
)]
8
9
×[
3
4
-(
7
16
-0.25)]
分析:按照小数、分数四则混合运算的运算顺序和小数、分数四则运算的计算法则进行计算,能用简便方法的用简便方法计算.
解答:解:(1)6.42×1.01-6.42,
=6.42×(1.01-1),
=6.42×0.01,
=0.0642;

(2)80.7×8.7+8.07×13,
=80.7×8.7+80.7×1.3,
=80.7×(8.7+1.3),
=80.7×10,
=807;

(3)
3
5
×153-0.6×53,
=0.6×(153-53),
=0.6×100,
=60;

(4)23.19+2.4+2.91+14.6,
=(23.19+2.91)+(2.4+14.6),
=26.1+17,
=43.1;

(5)2.6×99+2.6,
=2.6×(99+1),
=2.6×100,
=260;

(6)24×(
3
8
+
5
6
),
=24×
3
8
+
24×
5
6

=9+20,
=29;

(7)(
5
8
+
2
27
)×8+
11
27

=
5
8
×
8+
2
27
×
8+
11
27

=5+(
16
27
+
11
27
),
=5+1,
=6;

(8)
1
2
÷
[
2
3
×(
1
6
+
1
3
)],
=
1
2
÷
[
2
3
×
1
2
],
=
1
2
÷
1
3

=
1
2
×
3,
=1
1
2


(9)
8
9
×[
3
4
-(
7
16
-0.25)]
,,
=
8
9
×
[
3
4
-(
7
16
-
1
4
)],
=
8
9
×
[
3
4
-
3
16
],
=
8
9
×
9
16

=
1
2
点评:此题主要考查小数、分数四则混合运算的计算,完成本题要注意分析式中数据,运用合适的简便方法计算.
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