Toán Lớp 8: 2. Tính theo 2 cách:
540 x 9 + 480 x 9
476 : ( 17 x4 )
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Toán Lớp 8: 2. Tính theo 2 cách:
540 x 9 + 480 x 9
476 : ( 17 x4 )
Comments ( 2 )
a)\\
540 \times 9 + 480 \times 9\\
C1:540 \times 9 + 480 \times 9\\
= 4860 + 4320\\
= 9180\\
C2:540 \times 9 + 480 \times 9\\
= \left( {540 + 480} \right) \times 9\\
= 1020 \times 9\\
= 9180\\
b)\\
476:\left( {17 \times 4} \right)\\
C1:476:\left( {17 \times 4} \right)\\
= 476:68\\
= 7\\
C2:476:\left( {17 \times 4} \right)\\
= 476:17:4\\
= 28:4\\
= 7
\end{array}\]