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

Toán Lớp 8: thuc hien cac phep tinh sau a)-7×2(3x-4y) b)(x-3)(5x-4)

Tháng Sáu 22, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: thuc hien cac phep tinh sau
a)-7×2(3x-4y)
b)(x-3)(5x-4)

Comments ( 2 )

  1. chauhoangmy98
    chauhoangmy98
    22 Tháng Sáu, 2022 at 2:50 sáng
    Reply
    a,-7x^2(3x-4y)
    =-21x^3+28x^2y
    b,(x-3)(5x-4)
    =5x^2-4x-15x+12
    =5x^2-19x+12

  2. khanhlanchau
    khanhlanchau
    22 Tháng Sáu, 2022 at 2:50 sáng
    Reply
    a,-7x^2.(3x-4y)
    =(-7x^2. 3x)-(-7x^2. 4y)
    =-21x^3+28x^2y
    b,(x-3)(5x-4)
    =x.(5x-4)-3.(5x-4)
    =5x^2-4x-15x+12
    =5x^2-19x+12
    Cho mk xin hay nhất please
    Thank you

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

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