题目内容
能简算的要简算. 2182-1655-345 |
3200÷4÷25 |
298×99+298 | (40+8)×25 |
(500-275÷5)×4 | (970-90+20)÷20. |
分析:(1)根据连减的性质进行简算;
(2)根据除法的性质进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算;
(5)先算除法,再算减法,最后算乘法;
(6)先算减法,再算加法,最后算除法.
(2)根据除法的性质进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算;
(5)先算除法,再算减法,最后算乘法;
(6)先算减法,再算加法,最后算除法.
解答:解:
(1)2182-1655-345
=2182-(1655+345)
=2812-2000
=812;
(2)3200÷4÷25
=3200÷(4×25)
=3200÷100
=32;
(3)298×99+298
=298×(99+1)
=298×100
=29800;
(4)(40+8)×25
=40×25+8×25
=1000+200
=1200;
(5)(500-275÷5)×4
=(500-55)×4
=445×4
=1780;
(6)(970-90+20)÷20
=(880+20)÷20
=900÷20
=45.
(1)2182-1655-345
=2182-(1655+345)
=2812-2000
=812;
(2)3200÷4÷25
=3200÷(4×25)
=3200÷100
=32;
(3)298×99+298
=298×(99+1)
=298×100
=29800;
(4)(40+8)×25
=40×25+8×25
=1000+200
=1200;
(5)(500-275÷5)×4
=(500-55)×4
=445×4
=1780;
(6)(970-90+20)÷20
=(880+20)÷20
=900÷20
=45.
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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