a) 1/5 – 9/10 + -10/25 b) 1/4 – 7/8 + -9/10 c) 5/4 – 1/2 + -7/8 d) -5/8 – 1/3 + -7/6 e) -3/4 – 7/10 + -5/6 03/09/2021 Bởi Faith a) 1/5 – 9/10 + -10/25 b) 1/4 – 7/8 + -9/10 c) 5/4 – 1/2 + -7/8 d) -5/8 – 1/3 + -7/6 e) -3/4 – 7/10 + -5/6
Đáp án: a) `1/5 – 9/10 + (-10/25)` `=1/5 -9/10 – 2/5` `=2/10 – 9/10 -4/10 ` `= -11/10` b) `1/4 – 7/8 + -9/10` `=1/4 – 7/8 -9/10` `=10/40 – 35/40 -36/40` `=-61/40` c) `5/4 – 1/2 -7/8` `=10/8 – 4/8 -7/8` `= -1/8` d) `-5/8 – 1/3 -7/6` `=-20 /24 – 8/24 – 28/24` `= (-56)/24` e) `-3/4 – 7/10 -5/6` `= -45/60 – 42/60 – 50/60` `=-137/60` mong ctlhn Bình luận
Đáp án: ——- Giải thích các bước giải: a) `1/5` – `9/10` + `-10/25` =`(2-9-4)/10` =`-11/10` b) `1/4` – `7/8` + `-9/10` =`(2-7)/8` + `-9/10` =`-5/8` + `-9/10` =`(-25 – 36) / 40` =`-61/40` c)`5/4` – `1/2` + `-7/8` =`10/8` – `4/8` + `-7/8` =`(10 – 4 – 7)/8` =`-1/8` d)`-5/8` – `1/3` +`7/6` = `-15/24` – `8/24` + `28/24` =`(-15 – 8 + 28)/24` =`5/24` e)`-3/4` – `7/10` + `-5/6` =`-90/120` – `84/120` + `-100/120` =`(-90 – 84 – 100 )/120` =`-274/120` =`-137/60` Bình luận
Đáp án:
a) `1/5 – 9/10 + (-10/25)`
`=1/5 -9/10 – 2/5`
`=2/10 – 9/10 -4/10 `
`= -11/10`
b) `1/4 – 7/8 + -9/10`
`=1/4 – 7/8 -9/10`
`=10/40 – 35/40 -36/40`
`=-61/40`
c) `5/4 – 1/2 -7/8`
`=10/8 – 4/8 -7/8`
`= -1/8`
d) `-5/8 – 1/3 -7/6`
`=-20 /24 – 8/24 – 28/24`
`= (-56)/24`
e) `-3/4 – 7/10 -5/6`
`= -45/60 – 42/60 – 50/60`
`=-137/60`
mong ctlhn
Đáp án:
——-
Giải thích các bước giải:
a) `1/5` – `9/10` + `-10/25`
=`(2-9-4)/10`
=`-11/10`
b) `1/4` – `7/8` + `-9/10`
=`(2-7)/8` + `-9/10`
=`-5/8` + `-9/10`
=`(-25 – 36) / 40`
=`-61/40`
c)`5/4` – `1/2` + `-7/8`
=`10/8` – `4/8` + `-7/8`
=`(10 – 4 – 7)/8`
=`-1/8`
d)`-5/8` – `1/3` +`7/6`
= `-15/24` – `8/24` + `28/24`
=`(-15 – 8 + 28)/24`
=`5/24`
e)`-3/4` – `7/10` + `-5/6`
=`-90/120` – `84/120` + `-100/120`
=`(-90 – 84 – 100 )/120`
=`-274/120`
=`-137/60`