Tính hợp lí: 83 * ( 174 - 99) - 174 * ( 83 - 99 ) + 83 * 99

$$\begin{gathered} Tính hợp lí \\ a.83\times (174-99)-174\times (83-99)+83\times 99 \\ b.199\times (15-17)-199\times (-17+5) \\ c.38\times (25-17)-25\times (38-17)13\times (-83) \\ d.92\times (93-94)+93\times (94-92) \\ e.-39\times (5-99)+99\times (10-39) \end{gathered}$$