Bài 3. Thực hiện phép tính:
a, 21.( – 29) + (– 17).( – 13)
c, (– 143):(– 13) – (– 5).(– 12)
b, (– 11)2.3 – [3 – (– 5)( – 4)]
d, 17 – {(– 32) – (–3) 3 – [5.(– 41) – 12:(– 4)0 ]+ 1571}
Bài 3. Thực hiện phép tính: a, 21.( – 29) + (– 17).( – 13) c, (– 143):(– 13) – (– 5).(– 12) b, (– 11)2.3 – [3 – (– 5)( – 4)] d, 17 – {(– 32) – (–3) 3
By Nevaeh
Đáp án:
Giải thích các bước giải:
a) `21.( – 29) + (– 17).( – 13)`
`= -609 + 221`
`= -388`
b) `(– 11).2.3 – [3 – (– 5)( – 4)]`
`= -11 . 6 – (3 – 20)`
`= -66 – (-17)`
`= -49`
c) ` (– 143):(– 13) – (– 5).(– 12)`
`= 11 – 60`
`= -49`
d) `17 – {(– 32) – (–3) . 3 – [5.(– 41) – 12:(– 4)0 ]+ 1571}`
`= 17 – {-32 – (-9) – [-205 – (-3).0] + 1571}`
`= 17 – [-23 – (-205 – 0) +1571]`
`= 17 – [-23 – (-205) + 1571]`
`= 17 – (182 + 1571)`
`= 17 – 1753`
`= -1736`
`a) 21.(-29)+(-17).(-13)`
`=-609+221`
`=-388`
`b) (– 11)2.3 – [3 – (– 5)( – 4)]`
`= (– 11)2.3 – [3-20]`
`=(– 11)2.3 – (-17)`
`=(-22).3-(-17)`
`=(-66)-(-17)`
`=-49`
`c) (– 143):(– 13) – (– 5).(– 12)`
`=11-60`
`=-49`
`d)17 – {(– 32) – (–3) 3 – [5.(– 41) – 12:(– 4)0 ]+ 1571}`
`=17 – {(– 32) – (–3) 3 – [-205 – (-3).0 ]+ 1571}`
`=17 – {(– 32) – (–3) 3 – [-205 – 0 ]+ 1571}`
`=17 – {(– 32) – (–3) 3 – (-205)+ 1571}`
`=17 – {(-29). 3 – (-205)+ 1571}`
`=17 – {(-87) – (-205)+ 1571}`
`=17 – {118+ 1571}`
`=17 – 1689`
` =-1672`