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

Toán Lớp 6: CÂU 7: Tìm x, biết: a) 156 – (x+ 61) = 82 b) (x-35) -120 = 0 c) 124 + 3(118 – x) = 217

Toán Lớp 6: CÂU 7: Tìm x, biết:
a) 156 – (x+ 61) = 82 b) (x-35) -120 = 0
c) 124 + 3(118 – x) = 217 d) 2x – 49 = 5.32
e) (-35) . x = -210 f) (-7) . x = 42
g) 18 – x = – 70 h) x + (-8) = -25
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vote 5 sao và 20 đ
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Comments ( 1 )

  1. a) 156 – (x+61) = 82
    x+61 = 156 – 82 = 74
    x = 74 – 61 
    x = 13
    b) (x-35) -120 = 0
    x-35 = 0 + 120 = 120 
    x = 120 + 35
    x = 155
    c) 124 + 3(118 – x) = 217
    3(118 – x) = 217 – 124 = 93
    118 – x = 93 : 3 = 31
    x = 118 – 31
    x = 87
    d) 2x – 49 = 5.32
    2x = 160 + 49 = 209
    x = 209 : 2
    x = 104,5  ($\frac{209}{2}$)
    e) (-35) . x = -210
    x = -210 : (-35)
    x = 6
    f) (-7) . x = 42
    x = 42 : (-7)
    x = -6
    g) 18 – x = – 70
    x = 18 – 70
    x = -52
    h) x + (-8) = -25
    x = -25 + 8
    x = -17
    xin hay nhất 

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

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