Toán Lớp 5: help me
Tính nhanh:1,01 x 86,2 –86,2
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Toán Lớp 5: help me
Tính nhanh:1,01 x 86,2 –86,2
Comments ( 2 )
$\textit{1 , 01 × 86 , 2 – 86 , 2}$
$\textit{= 1 , 01 × 86 , 2 – 1 × 86 , 2}$
$\textit{= [ 1 , 01 – 1 ] × 86 , 2}$
$\textit{= 0 , 01 × 86 , 2}$
$\textit{= 0 , 862}$
1,01 xx 86,2 – 86,2
= 1,01 xx 86,2 – 86,2 xx 1
= 86,2 xx ( 1,01 – 1 )
= 86,2 xx 0,01
= 0,862