Đáp án+Giải thích các bước giải:
\begin{array}{|c|c|c|}\hline \text{4}&\text{5}&\text{3}&\text{23}\\\hline \text{7}&\text{6}&\text{1}&\text{43}\\\hline \text{8}&\text{9}&\text{0}&\text{72}\\\hline \text{6}&\text{6}&\text{2}&\text{38}\\\hline\end{array}
`4×5+3=23`
`7×6+1=43`
`8×9+0=72`
`6×6+2=38`