0.78×5-19/50+4×19/50 怎样简便计算

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0.78×5-19/50+4×19/50 怎样简便计算

0.78×5-19/50+4×19/50 怎样简便计算
0.78×5-19/50+4×19/50 怎样简便计算

0.78×5-19/50+4×19/50 怎样简便计算
0.78×5-19/50+4×19/50
=0.78×5+19/50×(4-1)
=3.9+0.38×3
=3.9+1.14
=5.04

0.78×5-19/50+4×19/50=5×39/50+(4-1)×19/50=(195+57)/50=252/50=126/25=5.04

0.78×5-19/50+4×19/50
= (78/100)×5 + 19/50(4-1)
=( 39×5)/50 +(3×19)/50
=(3×13×5)/50 +(3×19)/50
=(3×(65+19))/50
=(3×84)/50
= 126/25