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

Toán Lớp 7: tìm x: a) x+11/10=26/25 b)2x-2/5=17/35

Toán Lớp 7: tìm x:
a) x+11/10=26/25
b)2x-2/5=17/35

Comments ( 2 )

  1. a)x+11/10=26/25
    =>x=26/25-11/10
    =>x=52/50-55/50
    =>x=(-3)/50
    Vậy x=(-3)/50
    b)2x-2/5=17/35
    => 2x=17/35+2/5
    => 2x=17/35+14/35
    => 2x=31/35
    => x=31/35:2
    => x=31/70
    Vậy x=31/70 

  2. a) x+(11)/(10)=(26)/(25)
    ⇔x=(26)/(25)-(11)/(10)
    ⇔x=(52)/(50)-(55)/(50)
    ⇔x=-3/(50)
    Vậy x=-3/(50)
    b) 2x-2/5=(17)/(35)
    ⇔2x=(17)/(35)+2/5
    ⇔2x=(17)/(35)+(14)/(35)
    ⇔2x=(31)/(35)
    ⇔x=(31)/(35):2
    ⇔x=(31)/(35).(1)/2
    ⇔x=(31)/(70)
    Vậy x=(31)/(70)
     

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

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