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

Toán Lớp 7: bài 1 ( 0,12 . 3/4 + 1/7 ) .x = (0.5 – 3/5 ) . 1/2 bài 2. a. |65,9 – 137,45| + |115,9 – 37,45|

Tháng Chín 14, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: bài 1
( 0,12 . 3/4 + 1/7 ) .x = (0.5 – 3/5 ) . 1/2
bài 2.
a. |65,9 – 137,45| + |115,9 – 37,45|

Comments ( 2 )

  1. maitrucloan
    maitrucloan
    14 Tháng Chín, 2022 at 3:33 chiều
    Reply
    (0,12 . 3/4 + 1/7) . x = (0 . 5 – 3/5) . 1/2
    $\Leftrightarrow$ (9/100 + 1/7) . x = (0 – 3/5) . 1/2
    $\Leftrightarrow$ 163/700 . x = -3/5 . 1/2
    $\Leftrightarrow$ 163/700 . x = -3/10
    $\Leftrightarrow$ x = -3/10 : 163/700
    $\Leftrightarrow$ x = -210/163
    $\text{Vậy}$ x = -210/163
    _____________________
    |65,9 – 137,45| + |115,9 – 37,45|
    = |-71,55| + |78,45|
    = 71,55 + 78,45
    = 150

  2. dinhcongson
    dinhcongson
    14 Tháng Chín, 2022 at 3:33 chiều
    Reply
    Xin hay nhất cho nhóm.

    toan-lop-7-bai-1-0-12-3-4-1-7-0-5-3-5-1-2-bai-2-a-65-9-137-45-115-9-37-45

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

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