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

Toán Lớp 8: a,(7x-2)(x-y)+(8x-y)(x+1) b, 7x(4x-1)-(8x-y)(7x+1) c, 8x-(7x-1)(6x+2)-3x(x-1) d, (x-2)(x+2)-(2x-1)(x-2)

Home/ Toán Lớp 8: a,(7x-2)(x-y)+(8x-y)(x+1) b, 7x(4x-1)-(8x-y)(7x+1) c, 8x-(7x-1)(6x+2)-3x(x-1) d, (x-2)(x+2)-(2x-1)(x-2)

Toán Lớp 8: a,(7x-2)(x-y)+(8x-y)(x+1) b, 7x(4x-1)-(8x-y)(7x+1) c, 8x-(7x-1)(6x+2)-3x(x-1) d, (x-2)(x+2)-(2x-1)(x-2)

Tháng Sáu 21, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: a,(7x-2)(x-y)+(8x-y)(x+1)
b, 7x(4x-1)-(8x-y)(7x+1)
c, 8x-(7x-1)(6x+2)-3x(x-1)
d, (x-2)(x+2)-(2x-1)(x-2)

Comments ( 2 )

  1. thanhtung
    thanhtung
    21 Tháng Sáu, 2022 at 10:36 sáng
    Reply
    y10000
     

    toan-lop-8-a-7-2-y-8-y-1-b-7-4-1-8-y-7-1-c-8-7-1-6-2-3-1-d-2-2-2-1-2

  2. lanminhngoc
    lanminhngoc
    21 Tháng Sáu, 2022 at 10:36 sáng
    Reply
    Giải đáp + Lời giải và giải thích chi tiết:
     a) (7x-2)(x-y) + (8x-y )( x+1)
    = 7x^2 – 2x – 7xy + 2y + 8x^2 – xy + 8x – y
    = 15x^2 + 6x – 8xy + y
    b) 7x(4x – 1) – (8x – y)(7x+1)
    = 28x^2 – 7x – ( 56x^2 – 7xy + 8x – y)
    = 28x^2 – 7x – 56x^2 + 7xy – 8x + y
    = -28x^2 – 15x + 7xy + y
    c) 8x – (7x-1)(6x+2) – 3x(x-1)
    = 8x – (42x^2 – 6x + 14x – 2 ) – 3x^2 + 3x
    = 8x – 42x^2 – 8x + 2 – 3x^2 + 3x
    = -45x^2 +3x + 2
    d) (x-2)(x+2) – (2x-1)(x-2)
    = x^2 – 4 – (2x^2 – 5x + 2)
    = x^2 – 4 – 2x^2 + 5x – 2
    = -x^2 + 5x – 6

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

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