题目内容
(2012?儋州模拟)计算下列各题,怎样简便就怎样算.
35÷
+
( 40+4+0.4)×2.5
×
+
×
(
+
)×27×23.
35÷
7 |
5 |
5 |
7 |
( 40+4+0.4)×2.5
5 |
9 |
7 |
13 |
6 |
13 |
5 |
9 |
(
2 |
27 |
2 |
23 |
分析:(1)依据四则运算计算方法解答,
(2)(3)(4)运用乘法分配律解答.
(2)(3)(4)运用乘法分配律解答.
解答:解:(1)35÷
+
,
=25+
,
=25
;
(2)(40+4+0.4)×2.5,
=40×2.5+4×2.5+0.4×2.5,
=100+10+1,
=111;
(3)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)(
+
)×27×23,
=
×27×23+
×27×23,
=46+54,
=100.
7 |
5 |
5 |
7 |
=25+
5 |
7 |
=25
5 |
7 |
(2)(40+4+0.4)×2.5,
=40×2.5+4×2.5+0.4×2.5,
=100+10+1,
=111;
(3)
5 |
9 |
7 |
13 |
6 |
13 |
5 |
9 |
=(
7 |
13 |
6 |
13 |
5 |
9 |
=1×
5 |
9 |
=
5 |
9 |
(4)(
2 |
27 |
2 |
23 |
=
2 |
27 |
2 |
23 |
=46+54,
=100.
点评:解答此类题型的重点是:依据题干中各数的特点,正确选择并运用简便算法解答.
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