Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

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

Toán Lớp 6: 1. Tính a.12-(5-12)+7 b. (-457)+(-123)+23+237 c.(-135)+48+140+(-5) 2.Tìm x a.3-x=10 b.12-(x-5)=40

Toán Lớp 6: 1. Tính
a.12-(5-12)+7 b. (-457)+(-123)+23+237 c.(-135)+48+140+(-5)
2.Tìm x
a.3-x=10 b.12-(x-5)=40 c.(-3)-(x+2)=(-7)
d.12+x+(-5)=(-3)-15 e.(-14)-x-(-15)=(-2) f.(-3)+(-7)=x-23

Comments ( 1 )

  1. $#mind$
    1. Tính
    a.12 – (5 – 12) + 7
    = 12 – (- 7) + 7
    = 12 – 0
    = 12
    b. (- 457) + (- 123) + 23 + 237
    = [(-457) + 23] + [(- 123) + 237]
    = – 434 + 114
    = – 320
    c. (- 135) + 48 + 140 + (- 5)
    = [(- 135) + (- 5)] + (48 + 140)
    = – 140 + 188
    = 48
    2. Tìm x
    a. 3 – x = 10
    x = 3 – 10
    x = – 7
    Vậy x = – 7
    b. 12 – (x – 5) = 40
    x – 5 = 12 – 40
    x – 5= – 28
    x = – 28 + 5
    x = – 23
    Vậy x = – 23
    c. (- 3) – (x + 2) = (- 7)
    x + 2 = (- 3) – (- 7)
    x + 2 = 4
    x = 4 – 2
    x = 2
    Vậy x = 2
    d. 12 + x + (- 5) = (- 3) – 15
    12 + x + (- 5) = – 18
    12 + x = – 18 – (- 5)
    12 + x = – 13
    x = – 13 – 12
    x = – 25
    Vậy x = -25
    e.(- 14) – x – (- 15) = (- 2)
    (- 14) – x = (- 2) + (- 15)
    (- 14) – x = – 17
    x = (- 14) – (- 17)
    x = 3
    Vậy x = 3
    f.(- 3) + (- 7) = x – 23
    – 10 = x – 23
    x = (- 10) + 23
    x = 13
    Vậy x = 13
    Xiin ctlhn+5*+cảm ơn:3
    Chúc em thi học kì đạt kết quả cao nhé ^^ 

Leave a reply

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