`37 . 39 + 78 . 14` `+ 13 . 85 + 52 . 55`
`=37.39+39.2.14+ 13.5.17+13.4.5.11`
`=37.39+39.28+65.17+65.44`
`=39.(37+28)+65.(17+44)`
`=39.65+65.61`
`=65.(39+61)`
`=65 . 100`
`=6500`
tính hợp lí:
a) 5.11.18+9.31.10+4.29.45
b) 37.39+78.14+13.85+52.55
Tính:
P= 1.4+2.5+3.6+.......+52.55
So sánh A và B biết:
A=78.15-28/50+78.14 ; B=1999.1999/1997.2001
X-(20/11.13+20/13.15+...+20/52.55)=3/11
Ai nhanh mk til
B = 2/3.5 + 2/5.7 + 2/7.9 + ... + 2/37.39
tính A=1/3.5+1/5.7 +1/7.9 + ... +1/37.39
tính A=1/3.5+1/5.7 +1/7.9 + ... +1/37.39
3.3+6.6+9.9+....+90.90
4/3.5+4/5.7+4/7.9+.....4/37.39
tính B=1/3.5+1/5.7+1/7.9+...+1/37.39
Tính B=2/3.5+2/5.7+...+12/37.39
