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

Toán Lớp 7: 1. Tính: a) A= (1/38 – 1) x (1/37 – 1) x (1/36 -1 ) x…x (1/2 – 1) b) | -5/9 | + | 4/9| – (-2021) c) | 4,7 | – 1,5 – |-3,2| d) ( -1

Tháng Hai 9, 2023 Toán học 1 Comment 0 views

Toán Lớp 7: 1. Tính: a) A= (1/38 – 1) x (1/37 – 1) x (1/36 -1 ) x…x (1/2 – 1)
b) | -5/9 | + | 4/9| – (-2021)
c) | 4,7 | – 1,5 – |-3,2|
d) ( -1/2 ) mũ 3 + ( 5/6) mũ 0 – (-3/2) mũ 2 – (-1) mũ 10
e) 4 ( -1/3) mũ 0 – 2( -1/2) mũ 2 +3 (-1/2) + 1

Comments ( 1 )

  1. huyenmi76
    huyenmi76
    9 Tháng Hai, 2023 at 3:37 sáng
    Reply
    $(27/3)^{x}$ = 3
            $9^{x}$ = 3
         $3^{2.x}$ = 3
                    2.x = 1
                       x = 1 : 2
                       x = $\frac{1}{2}$ 
    Vậy x = $\frac{1}{2}$ 
    $9^{x-1}$ = $\frac{1}{9}$
    $9^{x-1}$ = $(1/3)^{2}$
    x – 1 = 2
    x = 2 – 1
    x = 1
    Vậy x = 1
    (xin hay nhất)
    Chúc bạn học tốt!!!

    toan-lop-7-1-tinh-a-a-1-38-1-1-37-1-1-36-1-1-2-1-b-5-9-4-9-2021-c-4-7-1-5-3-2-d-1

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

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