题目内容

计算下面各题,能简便的要简便.
0.35×101

43-(
3
5
+24÷
8
3
2.125×
1
4
+1.875÷4
1
4
-
1
4
÷3
0.4×(4.7-3.65) 12.5×2.6×0.8.
分析:(1)把101看作100+1,运用乘法分配律简算;
(2)先算括号内的除法,把
3
5
化为小数,运用减法的性质简算;
(3)把除法改为乘法,运用乘法分配律简算;
(4)先算除法,再算减法;
(5)先算括号内的,再算括号外的;
(6)运用乘法交换律与结合律简算.
解答:解:(1)0.35×101,
=0.35×(100+1),
=35+0.35,
=35.35;

(2)43-(
3
5
+24÷
8
3
),
=43-(0.6+24×
3
8
),
=43-(0.6+9),
=43-9-0.6,
=33.4;

(3)2.125×
1
4
+1.875÷4,
=2.125×
1
4
+1.875×
1
4

=(2.125+1.875)×
1
4

=4×
1
4

=1;

(4)3÷
1
4
-
1
4
÷3,
=3×4-
1
4
×
1
3

=12-
1
12

=11
11
12


(5)0.4×(4.7-3.65),
=0.4×1.05,
=0.42;

(6)12.5×2.6×0.8,
=(12.5×0.8)×2.6,
=10×2.6,
=26.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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