a) \(x \times 4 = 2048\)
b) \(5 \times x = 3055\)
c) \(x \times 6 = 4278\)
d) \(7 \times x = 5691\)
\(\eqalign{a) \ x \times 4 & = 2048 \cr x& = 2048:4 \cr x & = 512 \cr} \)
\(\eqalign{b) \ 5 \times x & = 3055 \cr x& = 3055:5 \cr x &= 611 \cr} \)
\(\eqalign{c) \ x \times 6 & = 4278 \cr x & = 4278:6 \cr x & = 713 \cr} \)
\(\eqalign{d) \ 7 \times x& = 5691 \cr x &= 5691:7 \cr x &= 813 \cr} \)
-- Mod Toán lớp 3
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