Question

Вычислите удобным способом б) 728*49 - 528*49, е) 999*156+156

Answer 1

б)
728 * 49 - 528 * 49 =
= 49 * (728 - 528) =
= 49 * 200 = 9800,

е)
999 * 156 + 156 = 
= 156 * (999 + 1) = 
= 156 * 1000 = 156000