题目内容
脱式计算.
375×(35÷7) | 13.8-4.6+0.2 | 4×32+32×32 |
(1457-1432)×24 | 240×35-28×16 | 125÷5×6. |
解:(1)375×(35÷7),
=375×5,
=1875;
(2)13.8-4.6+0.2,
=(13.8+0.2)-4.6,
=14-4.6,
=9.4;
(3)4×32+32×32,
=(4+32)×32,
=36×32,
=1152;
(4)(1457-1432)×24,
=25×24,
=25×4×6,
=100×6,
=600;
(5)240×35-28×16,
=8400-448,
=7952;
(6)125÷5×6,
=25×6,
=150.
分析:(1)先算小括号里的除法,再算括号外的乘法,
(2)从左向右进行计算即可,
(3)运用乘法的分配律进行简算,
(4)先算小括号里的减法,再算括号外的乘法,
(5)先同时求出两个乘法算式,再算减法,
(6)从左向右进行计算即可.
点评:此题考查了整数四则混合运算的顺序,注意灵活运用运算定律进行解答.
=375×5,
=1875;
(2)13.8-4.6+0.2,
=(13.8+0.2)-4.6,
=14-4.6,
=9.4;
(3)4×32+32×32,
=(4+32)×32,
=36×32,
=1152;
(4)(1457-1432)×24,
=25×24,
=25×4×6,
=100×6,
=600;
(5)240×35-28×16,
=8400-448,
=7952;
(6)125÷5×6,
=25×6,
=150.
分析:(1)先算小括号里的除法,再算括号外的乘法,
(2)从左向右进行计算即可,
(3)运用乘法的分配律进行简算,
(4)先算小括号里的减法,再算括号外的乘法,
(5)先同时求出两个乘法算式,再算减法,
(6)从左向右进行计算即可.
点评:此题考查了整数四则混合运算的顺序,注意灵活运用运算定律进行解答.
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