1:Thực hiên phép tính A)-12-(-13)+14 B):9-(-3)+(-30) C)-12-(-3-4)^2+15 16/10/2021 Bởi Maria 1:Thực hiên phép tính A)-12-(-13)+14 B):9-(-3)+(-30) C)-12-(-3-4)^2+15
a) -12 – (-13) + 14 = -12 + 13 + 14 = 1 + 14 = 15 b) 9 – (-3) + (-30) = 9 + 3 – 30 = 12 – 30 = -18 c) -12 – (-3 – 4)² + 15 = -12 – (-7)² + 15 = -12 – 49 + 15 = -46 Bình luận
`a)` `-12-(-13)+14` `=-12+13+14` `=15` `b)` `9-(-3)+(-30)` `=9+3-30` `=-18` `c)` `-12-(-3-4)^2`+15` `=-12-(-7)^2+15` `=-12-(-7).(-7)+15` `=-12-49+15` `=-46` Bình luận
a) -12 – (-13) + 14
= -12 + 13 + 14
= 1 + 14
= 15
b) 9 – (-3) + (-30)
= 9 + 3 – 30
= 12 – 30
= -18
c) -12 – (-3 – 4)² + 15
= -12 – (-7)² + 15
= -12 – 49 + 15
= -46
`a)` `-12-(-13)+14`
`=-12+13+14`
`=15`
`b)` `9-(-3)+(-30)`
`=9+3-30`
`=-18`
`c)` `-12-(-3-4)^2`+15`
`=-12-(-7)^2+15`
`=-12-(-7).(-7)+15`
`=-12-49+15`
`=-46`