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

Toán Lớp 8: tìm x 3/10.(1 − x) − 5 + 7x/4= 9x + 2/20 − 5x + 4/5

Toán Lớp 8: tìm x
3/10.(1 − x) − 5 + 7x/4= 9x + 2/20 − 5x + 4/5

Comments ( 2 )

  1. ~ Bạn tham khảo ~
    3/{10} .(1 − x) − {5 + 7x}/4= {9x + 2}/{20} − {5x + 4}/5
    <=> [6(1 − x)]/{20}− {5(5 + 7x)}/20= {9x + 2}/{20} − {4(5x + 4)}/20
    <=> 6-6x-25-35x=9x+2-20x-16
    <=> -6x-35x+20x-9x=2-16-6+25
    <=> -30x=5
    <=> x=-1/6
    Vậy S={1/6}

  2. ~ gửi bạn ~
    Giải đáp:
    x = -1/6 
    Lời giải và giải thích chi tiết:
    3/{10} .(1 − x) − {5 + 7x}/4= {9x + 2}/20 − {5x + 4}/5
    ⇔ 6.(1 − x) − 5.(5 + 7x) = 9x + 2 − 4.(5x + 4)
    ⇔ 6 − 6x − 25 − 35x = 9x + 2 − 20x − 16
    ⇔ −5 = 30x
    ⇔ x = −5/30 = −1/6

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