Toán Lớp 4: tính:
3x4x5=…
1+3×4=…
help
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Toán Lớp 4: tính:
3x4x5=…
1+3×4=…
help
Comments ( 2 )
$3$ x $4$ x $5$ $=$ $12$ x $5$ $=$ $60$
$1$ + $3$ x $4$ $=$ $1 + 12$ $=$ $13$
$#thuytrang18082009$
$\text{3×4×5=12×5=60}$
$\text{1+3×4=1+12=13}$
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$\text{Sử sụng quy tắc nhan chia trước,cộng trừ sau}$