18×5/7-5×4/7简便计算2011÷2011又2011/2012简便计算

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18×5/7-5×4/7简便计算2011÷2011又2011/2012简便计算

18×5/7-5×4/7简便计算2011÷2011又2011/2012简便计算
18×5/7-5×4/7简便计算
2011÷2011又2011/2012简便计算

18×5/7-5×4/7简便计算2011÷2011又2011/2012简便计算
18*5/7-4*5/7
=(18*5-4*5)/7
=(18-4)*5/7
=14*5/7
=2*5
=10
2011/(2011+2011/2012)
=2011/2011+2011/(2011/2012)
=1+2012
=2013

18×5/7-5×4/7
=5/7×(18-4)
=5/7×(14)
=10

(18-4)X5/7=14X5/7=2X5=10

口算的话,相当于(18-4) x 5 / 7 = 14x5/7 = 70/7 = 10