题目内容
怎样算简便就怎样算 715+265+335+285 |
125×(8×4)×5 | 125×96 |
759-159-63-37 | 301×30 | 630÷35. |
分析:(1)关键加法交换律和结合律进行简算;
(2)根据乘法结合律进行简算;
(3)96=8×12,然后再根据乘法结合律进行简算;
(4)根据减法的性质进行简算;
(5)301=300+1,然后再根据乘法分配律进行简算;
(6)35=7×5,然后再根据除法的性质进行简算.
(2)根据乘法结合律进行简算;
(3)96=8×12,然后再根据乘法结合律进行简算;
(4)根据减法的性质进行简算;
(5)301=300+1,然后再根据乘法分配律进行简算;
(6)35=7×5,然后再根据除法的性质进行简算.
解答:解:
(1)715+265+335+285,
=(715+285)+(265+335),
=1000+600,
=1600;
(2)125×(8×4)×5,
=(125×8)×(4×5),
=1000×20,
=20000;
(3)125×96,
=125×(8×12),
=(125×8)×12,
=1000×12,
=12000;
(4)759-159-63-37,
=(759-159)-(63+37),
=600-100,
=500;
(5)301×30,
=(300+1)×30,
=300×30+1×30,
=9000+30,
=9030;
(6)630÷35,
=630÷(7×5),
=630÷7÷5,
=90÷5,
=18.
(1)715+265+335+285,
=(715+285)+(265+335),
=1000+600,
=1600;
(2)125×(8×4)×5,
=(125×8)×(4×5),
=1000×20,
=20000;
(3)125×96,
=125×(8×12),
=(125×8)×12,
=1000×12,
=12000;
(4)759-159-63-37,
=(759-159)-(63+37),
=600-100,
=500;
(5)301×30,
=(300+1)×30,
=300×30+1×30,
=9000+30,
=9030;
(6)630÷35,
=630÷(7×5),
=630÷7÷5,
=90÷5,
=18.
点评:此题主要考查整数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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