Предмет: Алгебра, автор: Liptoooooooooooooon

Вычислите, используя формулу а² - b² = (a - b) (a + b) . = 1) 11-9 2) 12 8 3) 13.7 4) 14.6 5)15-5
пожалуйста помогите ​

Ответы

Автор ответа: KLEBEPKA
4

Ответ:

1) 11²-9²=(11-9)*(11+9)=2*20=40

2)12²-8²=(12-8)*(12+8)=4*20=80

3) 13²-7²=(13-7)*(13+7)=6*20=120

4) 14²-6²=(14-6)*(14+6)=8*20=160

5) 15²-5²=(15-5)*(15+5)=10*20=200

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