题目内容
6.42×1.01-6.42 | 80.7×8.7+8.07×13 |
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23.19+2.4+2.91+14.6 | 2.6×99+2.6 | 24×(
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(
|
|
|
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)
×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×(
+
),
=24×
+24×
,
=9+20,
=29;
(7)(
+
)×8+
,
=
×8+
×8+
,
=5+(
+
),
=5+1,
=6;
(8)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
×3,
=1
;
(9)
×[
-(
-0.25)],,
=
×[
-(
-
)],
=
×[
-
],
=
×
,
=
.
=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 |
=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 |
5 |
6 |
=9+20,
=29;
(7)(
5 |
8 |
2 |
27 |
11 |
27 |
=
5 |
8 |
2 |
27 |
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 |
=1
1 |
2 |
(9)
8 |
9 |
3 |
4 |
7 |
16 |
=
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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