题目内容
计算下面各题,能简便的要简便. 0.35×101 | 43-( ![]() ![]() |
2.125×![]() | 3÷![]() ![]() |
0.4×(4.7-3.65) | 12.5×2.6×0.8. |
解:(1)0.35×101,
=0.35×(100+1),
=35+0.35,
=35.35;
(2)43-(
+24÷
),
=43-(0.6+24×
),
=43-(0.6+9),
=43-9-0.6,
=33.4;
(3)2.125×
+1.875÷4,
=2.125×
+1.875×
,
=(2.125+1.875)×
,
=4×
,
=1;
(4)3÷
-
÷3,
=3×4-
×
,
=12-
,
=11
;
(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.
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
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.
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.
=0.35×(100+1),
=35+0.35,
=35.35;
(2)43-(


=43-(0.6+24×

=43-(0.6+9),
=43-9-0.6,
=33.4;
(3)2.125×

=2.125×


=(2.125+1.875)×

=4×

=1;
(4)3÷


=3×4-


=12-

=11

(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.
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)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.
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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