Toán Lớp 4: tính bằng hai cách :
a) (8 x 23) : 4 b) (15 x 24) : 6
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Toán Lớp 4: tính bằng hai cách :
a) (8 x 23) : 4 b) (15 x 24) : 6
Comments ( 2 )
$\text{a.C1 : ( 8 x 23 ) : 4 }$
$\text{= 184 : 4 }$
$\text{= 46}$
$\text{C2 : ( 8 x 23 ) : 4 }$
$\text{= 8 : 4 x 23}$
$\text{= 2 x 23 }$
$\text{= 46}$
$\text{b. C1 : ( 15 x 24 ) : 6}$
$\text{= 360 : 6 }$
$\text{= 60 }$
$\text{C2 : ( 15 x 24 ) : 6}$
$\text{= 24 : 6 x 15 }$
$\text{= 4 x 15 }$
$\text{= 60}$
a. (8 x 23) : 4 = 184 : 4 = 46
(8 x 23) : 4 = 8 : 4 x 23 = 2 x 23 = 46
b. (15 x 24) : 6 = 360 : 6 = 60
(15 x 24) : 6 = 15 x (24 : 6) = 15 x 4 = 60