题目内容

(2012?儋州模拟)计算下列各题,怎样简便就怎样算.
35÷
7
5
+
5
7

( 40+4+0.4)×2.5
5
9
×
7
13
+
6
13
×
5
9
                     
2
27
+
2
23
)×27×23.
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.
解答:解:(1)35÷
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
)×27×23,
=
2
27
×27×23+
2
23
×27×23,
=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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