题目内容
能简算则简算
12.45-9.62+0.37 | 0.83+0.9+0.1+0.17 | 6.32-(5.26-3.68) |
35×8+35×11+35 | 32×125×25 | (135+415)÷5-16. |
分析:(1)先算减法,再算加法;
(2)根据加法交换律和结合律进行简算;
(3)先算小括号里面的减法,再算小括号外面的减法;
(4)根据乘法分配律进行简算;
(5)把32拆成4×8,然后再根据乘法交换律和结合律进行简算;
(6)先算小括号里面的加法,再算除法,最后算减法.
(2)根据加法交换律和结合律进行简算;
(3)先算小括号里面的减法,再算小括号外面的减法;
(4)根据乘法分配律进行简算;
(5)把32拆成4×8,然后再根据乘法交换律和结合律进行简算;
(6)先算小括号里面的加法,再算除法,最后算减法.
解答:解:(1)12.45-9.62+0.37,
=2.83+0.37
=3.2;
(2)0.83+0.9+0.1+0.17,
=(0.83+0.17)+(0.9+0.1),
=1+1,
=2;
(3)6.32-(5.26-3.68),
=6.32-1.58,
=4.74;
(4)35×8+35×11+35,
=35×(8+11+1),
=35×20,
=700;
(5)32×125×25,
=(4×8)×125×25,
=(125×8)×(25×4),
=1000×100,
=100000;
(6)(135+415)÷5-16,
=550÷5-16,
=110-16,
=94.
=2.83+0.37
=3.2;
(2)0.83+0.9+0.1+0.17,
=(0.83+0.17)+(0.9+0.1),
=1+1,
=2;
(3)6.32-(5.26-3.68),
=6.32-1.58,
=4.74;
(4)35×8+35×11+35,
=35×(8+11+1),
=35×20,
=700;
(5)32×125×25,
=(4×8)×125×25,
=(125×8)×(25×4),
=1000×100,
=100000;
(6)(135+415)÷5-16,
=550÷5-16,
=110-16,
=94.
点评:四则混合运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.
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