125.7.5(-8) 59.(-12)+12.(-41)
25.(-28)+(-25).72-10^3. 4.(-5)^2+6.(-5)-20
a) 3/4+-7/12. B)-2/3-2/15
c)1/3.5/7. d) 7/27.36/14
e)21/25+-7/31+4/25+-24/31+1/2
F) 53/45+-3/29-8/45-26/29-5/7
125.7.5(-8) 59.(-12)+12.(-41)
25.(-28)+(-25).72-10^3. 4.(-5)^2+6.(-5)-20
a) 3/4+-7/12. B)-2/3-2/15
c)1/3.5/7. d) 7/27.36/14
e)21/25+-7/31+4/25+-24/31+1/2
F) 53/45+-3/29-8/45-26/29-5/7
Đáp án + giải thích bước giải :
`1) 125 . 7 . 5 . (-8)`
`= -35000`
`2) 59 . (-12) + 12 . (-41)`
`= -1200`
`3) 25 . (-28) + (-25) . 72 – 10^3`
`= -3500`
`4) -2/3 – 2/15`
`= -4/5`
`5) 1/3 . 5/7`
`= 5/21`
`6) 7/27 . 36/14`
`= 2/3`
`7) 21/25 + (-7/31) + 4/25 + (-24/31) + 1/2`
`= 1/2`
`8) 53/45 + (-3/29) – 8/45 – 26/29 – 5/7`
`= -5/7`