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800➗25用简便方法计算

600➗15+600➗5用简便方法计算 600➗15+600➗5 =40+120 =160 直接计算

计算: (812-56x12)➗28 =【812-(50+6)x12】➗28 =(812-600-72)➗28 =140➗28 =5

8.75➗2.5*8.75➗2.5用简便方法 8.75➗2.5*8.75➗2.5 =3.5*3.5 =12.25 直接计算 没有简算

3.38÷18=0.187(7上面点个点,表示7循环) 2.3÷99=0.023(23上面点个点,表示23循环) 47 ÷ 22 = 2.136(36上面点个点,表示36循环) 竖式见图:

=125➗(5x5) =125➗25 =5

12.6x7.6x2.32➗1.9➗1.4➗2.9如何用简便计算? 12.6x7.6x2.32➗1.9➗1.4➗2.9 =(12.6÷4)*(7.6÷1.9)*(2.32÷2.9) =3.15*4*0.8 =10.08

(980-184-16)➗35 =[980-(184+16)]➗35 =[980-200]➗35 =780➗35 =(770+10)➗35 =770➗35+10➗35 =22+2/7 =22又2/7

结合律。 列式为: 2100➗42 =2100➗(7x6) =2100➗7➗6 =300➗6 =50

926➗125用简便方法算 926➗125 =(1000-74)➗125 =1000➗125-74➗125 =8-0.592 =7.408

:52➗5十53➗5十54➗5十55➗5十56➗5 =(52+53+54+55+56)÷5 =54*5÷5 =54

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