√ 28 + √ 63 = 2 √ 7 + 3 √ 7 = 5 √ 7 --------------------------------------- √ 99 - √ 176 = 3 √ 11 - 4 √ 11 = ( - √ 11 ) --------------------------------------- 2 √ 50 - 5 √ 200 = ( 2 * 5 ) √ 2 - ( 5 * 10 √ 2 ) = 10 √ 2 - 50 √ 2 = ( - 40 √ 2 ) ---------------------------------------- 5 √ 92 - √ 2300 = 5 √ 92 - 5 √ 92 = 0
1)√28+√63=√4*7+√9*7=2√7+3√7=5√7 2)√99-√176=√9*11-√16*11=3√11-4√11=-1√11 3)2√50-5√200=2√2*25-5√2*100=2*5√2-5*10√2=10√2-50√2=-40√2 4)5√92-√2300=5√4*23-√100*23=5*2√23-10√23=10√23-10√23=0