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

Toán Lớp 5: tính bằng cách thuận tiện nhất a) 135,6 : 250: 0,4 b) 25,5 x 99 + 255: 10

Toán Lớp 5: tính bằng cách thuận tiện nhất
a) 135,6 : 250: 0,4
b) 25,5 x 99 + 255: 10

Comments ( 2 )

  1. $\text{#Ming Ra}$
    $\text{a)135,6:250:0,4}$
    $\text{=135,6:0,4:250}$
    $\text{=339:250}$
    $\text{=1,356}$
    $\text{b)25,5×99+255:10}$
    $\text{=25,5×99+25,5×1}$
    $\text{=25,5×99+1}$
    $\text{=22,5×100}$
    $\text{=2550}$
    $\text{@Bulletproof.Boy.Scout}$

  2. $\textit{#Jasmine#}$
    a) 135,6 : 250 : 0,4
    = 135,6 : ( 250 xx 0,4 )
    = 135,6 : 100
    = 1,356
    b) 25,5 xx 99 + 255 : 10
    = 25,5 xx 99 + 25,5 xx 1
    = 25,5 xx ( 99 + 1 )
    = 25,5 xx 100
    = 2550

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