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

Toán Lớp 6: c) 23 – 5x = 33 d) 72 : (9 + 7x) = 210 : 27 nhanh nha

Toán Lớp 6: c) 23 – 5x = 33 d) 72 : (9 + 7x) = 210 : 27
nhanh nha

Comments ( 2 )

  1. Giải đáp:
     $c) 23-5x=33$
    $⇒ 5x=23-33$
    $⇒ 5x= -10$
    $⇒ x=(-10):5$
    $⇒ x=-2$
    $\text{Vậy x=-2}$
    $d) 72:(9+7x)=210:27$
    $⇒ 72:(9+7x)= \dfrac{210}{27}$
    $⇒ 9+7x= 72:\dfrac{70}{9}$
    $⇒ 9+7x= \dfrac{324}{35}$
    $⇒ 7x= \dfrac{324}{35}-9$
    $⇒ 7x= \dfrac{9}{35}$
    $⇒ x= \dfrac{9}{35}:7$
    $⇒ x= \dfrac{9}{245}$
    $Vậy$ $x=\dfrac{9}{245}$
     

  2. c)
    23-5x=33
    5x=23-33
    5x=-10
    x=(-10):5
    x=-2
    Vậy x=-2
    d)
    72:(9+7x)=210:27
    72:(9+7x)=70/9
    9+7x=72: 70/9
    9+7x=324/35
    7x=324/35 -9
    7x=9/35
    x=9/35 :7
    x=9/245
    Vậy x=9/245
    $@Masonn$
     

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