99×83=(....×....)-(....×....) 123×102=(.....×....)tambah (.....×....)= Tolong dibantu buat dikumpul besok

99×83=(99×100)-(99×17)
= 9.900 -1.683=8.217

123×102=(123×100)+(123×2)
= 12.300+246=12.546.