题目内容
用简便方法计算.
(125+7)×8 | 3200÷25÷4 |
3.27+6.4+2.73+4.6 | 25×44 |
6.45-2.56-1.44. |
分析:(1)(125+7)×8,运用乘法分配律进行简算;
(2)3200÷25÷4,根据除法的运算性质进行简算;
(3)3.27+6.4+2.73+4.6,运用加法交换律和结合律进行简算;
(4)25×44,运用乘法结合律进行简算;
(5)6.45-2.56-1.44.根据减法的运算性质进行简算.
(2)3200÷25÷4,根据除法的运算性质进行简算;
(3)3.27+6.4+2.73+4.6,运用加法交换律和结合律进行简算;
(4)25×44,运用乘法结合律进行简算;
(5)6.45-2.56-1.44.根据减法的运算性质进行简算.
解答:解:(1)(125+7)×8,
=125×8+7×8,
=1000+56,
=1056;
(2)3200÷25÷4,
=3200÷(25×4),
=3200÷100,
=32;
(3)3.27+6.4+2.73+4.6,
=(3.27+2.73)+(6.4+4.6),
=6+11,
=17;
(4)25×44,
=(25×4)×11,
=100×11,
=1100;
(5)6.45-2.56-1.44,
=6.45-(2.56+1.44),
=6.45-4,
=2.45.
=125×8+7×8,
=1000+56,
=1056;
(2)3200÷25÷4,
=3200÷(25×4),
=3200÷100,
=32;
(3)3.27+6.4+2.73+4.6,
=(3.27+2.73)+(6.4+4.6),
=6+11,
=17;
(4)25×44,
=(25×4)×11,
=100×11,
=1100;
(5)6.45-2.56-1.44,
=6.45-(2.56+1.44),
=6.45-4,
=2.45.
点评:此题考查的目的是理解掌握整数加法、乘法的运算定律和减法、除法的运算性质,并且能够灵活运用这些运算定律和运算性质进行简便计算.
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