Question

Solve: $28945\times 99-(-28945)$

Answer 1

We have

$28945\times 99-(-28945)$

$=28945\times 99+28945$ $[\because –(–a)=a]$

$=28945\times 99+28945\times 1$ $[\because a=a\times 1]$

$=28945\times (99+1)$ $[\because a\times b+a\times c=a(b+c\left)\right]$

$=28945\times 100$

$=2894500$