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

Toán Lớp 5: ai cứu với ạ Tìm x a) X x 2 + X x $\dfrac{3}{8}$ = $\dfrac{5}{2}$ b)???? x 5 -???? x $\dfrac{5}{7}$ = $\dfrac{8}{7}$

Toán Lớp 5: ai cứu với ạ
Tìm x
a) X x 2 + X x $\dfrac{3}{8}$ = $\dfrac{5}{2}$
b)???? x 5 -???? x $\dfrac{5}{7}$ = $\dfrac{8}{7}$

Comments ( 1 )

  1. Giải đáp:+Lời giải và giải thích chi tiết:
     a) x × 2+x × 3/8=5/2
    x × (2+3/8)=5/2
    x × (16/8 + 3/8)=5/2
    x × 19/8 =5/2
    x=5/2:19/8
    x=5/2 × 8/19
    x=40/58 = 20/19
    Vậy  x=20/19
    b) x×5-x×5/7=8/7
    x×(5-5/7)=8/7
    x×(35/7 – 5/7)=8/7
    x×30/7=8/7
    x=8/7 : 30/7
    x=8/7 × 7/30
    x=8/30 = 4/15
    Vậy  x= 4/15

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