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

Toán Lớp 5: A)8x9x17+6x70x12+13x4x18 B)5/6+1/4×4/3 Tính bằng cách hợp lí (nếu có thể)

Toán Lớp 5: A)8x9x17+6x70x12+13x4x18
B)5/6+1/4×4/3
Tính bằng cách hợp lí (nếu có thể)

Comments ( 2 )

  1. Xin hay nhất nhé tus ^_^
    a) 8×9×17+6×70×12+13×4×18
    =72×17+72×70+13×72
    =72×(17+70+13)
    =72×100
    =7200
    b) $\frac{5}{6}$ + $\frac{1}{4}$ × $\frac{4}{3}$ 
    = $\frac{5}{6}$ + $\frac{1}{3}$ 
    = $\frac{5}{6}$ + $\frac{2}{6}$ 
    = $\frac{7}{6}$ 

  2. a) 8 xx 9 xx 17 + 6 xx 70 xx 12 + 13 x 4 xx 18
    = ( 8 xx 9) xx 17 + ( 6 xx 12) xx 70 + 13 xx ( 4 xx 18)
    = 72 xx 17 + 72 xx 70 + 13 xx 72
    = 72 xx ( 17 + 70 + 13)
    =72 xx 100
    = 7200
    b) 5/6 + 1/4 xx 4/3
    = 5/6+  1/3
    = 5/6 + 2/6
    = 7/6
     

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