25×19的简便计算 5/7+19/25×4+21/25×19怎样做简便

5/7+19/25×4+21/25×19怎样做简便  

5/7+19/25×4+21/25×19怎样做简便

5/7+19/25×4+21/25×19
=5/7+（19/25）X(4+21)
=5/7+19
=19又7分之5

5/7+19/25*4+21/25*19简便方法

5/7+19/25*4+21/25*19
=5/7+(19*4+21*19)/25
=5/7+19*(4+21)/25
=5/7+19
=19又5/7

5/7+19/25x4+21/25x19

5/7+19/25x4+21/25x19
=5/7+4/25×19+21/25×19
=5/7+19×(4/25+21/25)
=5/7+19×1
=5/7+19
=19又5/7

19/25×5/7 7/25×19/7 19/7×3/25的简便计算

19/25×5/7+7/25×19/7+19/7×3/25
=19/25×5/7+19/25×7/7+19/25×3/7
=19/25×(5/7+7/7+3/7)
=19/25×15/7
=57/35

(7+19/25)*0.4+(7+19/25)*60%-0.4除3/5 简算

(7+19/25)*0.4+(7+19/25)*60%-0.4/3
=(7+19/25)*0.4+(7+19/25)*(1-0.4)-0.4/3 0.4=40%
=7+19/25-2/15
=7+(57-6)/75
=7又17/25

5/19×25×4/5×19 简便方法计算

5/19×25×4/5×19
=(25×4/5)×(5/19×19)
=20×5
=100

18/25*4+21/25*18的简便运算

18/25*4+21/25*18
=4/25*18+21/25*18
=(4/25+21/25)*18
=1*18
=18

3.5*1.3-37。5/25怎样做简便

先做37.5/25 = (37.5*4)/(25*4) = 150/100 = 1.5，由于这个结果是1.5，所以可以拆解前面的数，原式 = (2+1.5)*1.3 - 1.5 = 2*1.3 + 1.5*(1.3-1) = 2.6 + 1.5*0.3 = 2.6 + 0.45 = 3.05

5/419÷(19/7+19/12=

5/419÷(19/7+19/12)
=5/419÷19×(1/7+1/12)
=5/419÷(19×19/84)
=(5×84)/(419×19×19)
=420/151259