Tìm x:
a) \(x \times 4 = 1608\)
b) \(7 \times x = 4942\)
\(\eqalign{ a) \ x \times 4 & = 1608 \cr x & = 1608:4 \cr x &= 402 \cr} \\\eqalign{ b) \ 7 \times x &= 4942 \cr x &= 4942:7 \cr x &= 706 \cr} \)
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