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

Toán Lớp 7: 1> (3x-1) ( 2x+7) –(x+1) (6x-5) 2> (3x-5) (7-5x) + (5x+2) (3x-2)-2 3> x(x-1/3) -1/2x (2x-3) 4> 6x^2 – (2x+5) (3x-2) 5> x( x+ 1/5)- (2x-

Tháng Một 3, 2023 Toán học 2 Comments 0 views

Toán Lớp 7: 1> (3x-1) ( 2x+7) –(x+1) (6x-5)
2> (3x-5) (7-5x) + (5x+2) (3x-2)-2
3> x(x-1/3) -1/2x (2x-3)
4> 6x^2 – (2x+5) (3x-2)
5> x( x+ 1/5)- (2x-5) (1/2+4)

Comments ( 2 )

  1. daithanh
    daithanh
    3 Tháng Một, 2023 at 3:16 sáng
    Reply
    Giải đáp:
    1)18x-2
    2)42x-41
    3)7/6x
    4)-11x+10
    5)x²-44/5x+45/2
    Lời giải và giải thích chi tiết:
    1)(3x-1)(2x+7)-(x+1)(6x-5)
    =6x²+21x-2x-7-(6x²-5x+6x-5)
    =6x²+21x-2x-7-6x²+5x-6x+5
    =(6x²-6x²)+(21x-2x+5x-6x)+(-7+5)
    =18x-2
    2)(3x-5)(7-5x)+(5x+2)(3x-2)-2
    =21x-15x²-35+25x+15x²-10x+6x-4-2
    =(-15x²+15x²)+(21x+25x-10x+6x)+(-35-4-2)
    =42x-41
    3)x(x-1/3)-1/2x(2x-3)
    =x²-1/3x-x²+3/2x
    =(x²-x²)+(-1/3x+3/2x)
    =7/6x
    4)6x²-(2x+5)(3x-2)
    =6x²-(6x²-4x+15x-10)
    =6x²-6x²+4x-15x+10
    =(6x²-6x²)+(4x-15x)+10
    =-11x+10
    5)x(x+1/5)-(2x-5)(1/2+4)
    =x²+1/5x-(2x-5). 9/2
    =x²+1/5x-9x+45/2
    =x²-44/5x+45/2

  2. lanngocha
    lanngocha
    3 Tháng Một, 2023 at 3:16 sáng
    Reply
    Chữ hơi xấu T^T

    toan-lop-7-1-3-1-2-7-1-6-5-2-3-5-7-5-5-2-3-2-2-3-1-3-1-2-2-3-4-6-2-2-5-3-2-5-1-5-2

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

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