题目内容
(2010?夹江县模拟)怎样简便就怎样算.
(1)1.5÷1.8+1.3×0.6
(2)25×1.25×32
(3)(
+
)÷
+
(4)56×(
+
-
)
(1)1.5÷1.8+1.3×0.6
(2)25×1.25×32
(3)(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
(4)56×(
| 4 |
| 7 |
| 5 |
| 8 |
| 3 |
| 4 |
分析:(1)(3)依据四则运算计算方法,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的解答,
(2)化32=4×8,再运用乘法交换律和乘法结合律解答,
(4)运用乘法分配律解答.
(2)化32=4×8,再运用乘法交换律和乘法结合律解答,
(4)运用乘法分配律解答.
解答:解:(1)1.5÷1.8+1.3×0.6,
=
+0.78,
=1
;
(2)25×1.25×32,
=25×1.25×8×4,
=(25×4)×(1.25×8),
=100×10,
=1000;
(3)(
+
)÷
+
,
=
÷
+
,
=
+
,
=1.15;
(4)56×(
+
-
),
=56×
+56×
-56×
,
=32+35-42,
=67-42,
=25.
=
| 5 |
| 6 |
=1
| 46 |
| 75 |
(2)25×1.25×32,
=25×1.25×8×4,
=(25×4)×(1.25×8),
=100×10,
=1000;
(3)(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
=
| 21 |
| 20 |
| 7 |
| 3 |
| 7 |
| 10 |
=
| 9 |
| 20 |
| 7 |
| 10 |
=1.15;
(4)56×(
| 4 |
| 7 |
| 5 |
| 8 |
| 3 |
| 4 |
=56×
| 4 |
| 7 |
| 5 |
| 8 |
| 3 |
| 4 |
=32+35-42,
=67-42,
=25.
点评:本题主要考查学生运用四则运算计算方法,以及四则运算简便算法的能力.
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