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

Toán Lớp 4: tính nhanh a]3/4 +2/5 + 1/4 +3/5.b]2/3 x 3/4 x 4/5 x 5/6.c].4/5 – 2/3 + 1/5 – 1/3

Toán Lớp 4: tính nhanh a]3/4 +2/5 + 1/4 +3/5.b]2/3 x 3/4 x 4/5 x 5/6.c].4/5 – 2/3 + 1/5 – 1/3

Comments ( 2 )

  1. a)3/4 +2/5 + 1/4 +3/5
    =(3/4+1/4)+(2/5+3/5)
    =1+1
    =2
    b)2/3 xx 3/4 xx 4/5 xx 5/6
    =(2/3xx3/4)xx(4/5xx5/6)
    =1/2xx2/3
    =1/3
    c)4/5 – 2/3 + 1/5 – 1/3
    =(4/5+1/5)-(2/3+1/3)
    =1-1
    =0
     

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     a) $\dfrac{3}{4}$+$\dfrac{2}{5}$+$\dfrac{1}{4}$+$\dfrac{3}{5}$
    =($\dfrac{3}{4}$+$\dfrac{1}{4}$)+($\dfrac{2}{5}$+$\dfrac{3}{5}$
    =$\dfrac{4}{4}$+$\dfrac{5}{5}$
    =1+1
    =2
    b)$\dfrac{2}{3}$x$\dfrac{3}{4}$x$\dfrac{4}{5}$x$\dfrac{5}{6}$
    =($\dfrac{2}{3}$x$\dfrac{3}{4}$)x($\dfrac{4}{5}$x$\dfrac{5}{6}$)
    =$\dfrac{1}{2}$x$\dfrac{2}{3}$
    =$\dfrac{1}{3}$
    c) $\dfrac{4}{5}$-$\dfrac{2}{3}$+$\dfrac{1}{5}$-$\dfrac{1}{3}$
    =($\dfrac{4}{5}$+$\dfrac{1}{5}$)-($\dfrac{2}{3}$+$\dfrac{1}{3}$)
    =$\dfrac{5}{5}$-$\dfrac{3}{3}$
    =1-1
    =0

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