Bài $5:$ Rút gọn:
`-30-[95-40-30]`
`(273-120)-(273-120)`
`-(294+130)+(94+130)`
Bài $5:$ Rút gọn: `-30-[95-40-30]` `(273-120)-(273-120)` `-(294+130)+(94+130)`
By Delilah
By Delilah
Bài $5:$ Rút gọn:
`-30-[95-40-30]`
`(273-120)-(273-120)`
`-(294+130)+(94+130)`
– 30 – [95 – 40 – 30] = – 30 – 95 + 40 + 30
= – 125 + (40 + 30)
= – 125 + 70
= – 55
(273 – 120) – (237 – 120) = 270 – 120 – 237 + 120
= (270 – 270) + (-120 + 120)
= 0 + 0
= 0
– (294 + 130) + (94 + 130) = – 294 – 130 + 94 + 130
= (-294 + 94) + (-130 + 130)
= -200 + 0
= -200
a) $-30-[95-40-30]=-30-95+40+30=(-30+30)+(-95+40)=0+(-55)=-55$
b) $(273-120)-(273-120)=273-120-273+120=(273-273)+(-120+120)=0+0=0$
c) $-(294+130)+(94+130)=-294-130+94+130=(-294+94)+(-130+130)=-200+0=-200$
$\text{Cho mình xin hay nhất ạ!}$