Question

Tính bằng cách thuận tiện nhất a.135+245+365+55 b.136*24+72*136+136 c.1999*56+1999*55-1999

Answer 1

a: =(135+365)+245+55=300+500=800

b: =136(24+72+1)=136*97=13192

c: =1999(56+55-1)=219890

Answer 2

\(a,=\left(135+365\right)+\left(245+55\right)=500+300=800\)

\(b,=136.\left(24+72+1\right)=136.97=13192\)

\(c,=1999.\left(56+55-1\right)=1999.100=199900\)

Answer 3

`a) 135 + 245 + 365 + 55`

`= (135+365)+(245+55)`

`= 500 + 300`

`= 800`

`b) 136 xx 24 + 72 xx 136 + 136`

`= 136 xx 24 + 72 xx 136 + 136 xx1`

`= 136 xx (24+72+1)`

`= 136 xx 97`

`= 13192`

`c) 1999 xx 56 + 1999 xx 55 - 1999`

`= 1999 xx 56 + 1999 xx 55 - 1999xx1`

`= 1999xx(56+55-1)`

`= 1999xx110`

`= 219890`