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

Toán Lớp 7: a) 2.3 mũ x = 162 b) 5.x mũ 3 = 40 c) (x+2) mũ 3 = -27 d) (2x -1) ) mũ 2 = 25 ê) (x+1/2)mũ 2 = 25/4

Tháng Sáu 18, 2022 Toán học 1 Comment 0 views

Toán Lớp 7: a) 2.3 mũ x = 162
b) 5.x mũ 3 = 40
c) (x+2) mũ 3 = -27
d) (2x -1) ) mũ 2 = 25
ê) (x+1/2)mũ 2 = 25/4

Comments ( 1 )

  1. diepbich93
    diepbich93
    18 Tháng Sáu, 2022 at 5:07 chiều
    Reply
    text{#Orca}
    a) 2 . 3^x = 162
    3^x = 162 : 2
    3^x = 81
    3^x = 3^4
    => x = 4
    b) 5 . x^3 = 40
    x^3 = 40 : 5
    x^3 = 8
    x^3 = 2^3
    => x = 2
    c) (x + 2)^3 = -27
    (x + 2)^3 = (-3)^3
    x + 2 = -3
    => x = -5
    d) (2x – 1)^2 = 25
    (2x – 1)^2 = 5^2
    2x – 1 = 5
    2x = 6
    x = 6 : 2 = 3

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

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