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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: Bài 1: Thực hiện phép tính (tính nhanh nếu có thể) a) (– 15) + 45

Toán Lớp 6: Bài 1: Thực hiện phép tính (tính nhanh nếu có thể)
a) (– 15) + 45

c) (–4). (–6). (–5)
d) 15 – (–85) + 3mũ4 -100
f) – 71(96 – 30) – 96(30 – 71)
giúp mình

Comments ( 2 )

  1. a)
    (– 15) + 45 = 30
    c.
    (–4). (–6). (–5)
    = – (  4 . 6 . 5 )
    = – 120
    d.
    15 – (–85) + 3^4  -100
    = 15 – (–85) + 81 – 100
    = 100 + -19 
    = 81
    f.
    – 71(96 – 30) – 96(30 – 71)
    = – 71 . 66 – 96 . ( – 41 )
    = (-4686) – (-3936)
    = -750

  2. a) (– 15) + 45= 30
    b)(-4).(-5).(-6)= -120
    d) 15-(-85)+$3^{4}$ -100= 100+$3^{4}$-100= $3^{4}$
    f) –71(96 – 30) – 96(30 – 71)
    = (-71.96)+(71.30)-(96.30)-(-71.96)
    =(71.30)-(96.30)
    =30.(71-96)
    =30.(-25)
    =-750

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222-9+11+12:2*14+14 = ? ( )

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