Используя формулу (a + b)2 = a2 + 2ab + b2, найди значения квадратов: 12^2 =...... + 40 +..... =.... ;
15^2 = ......+ 100 +...... = ....;
16^2 = .....+ 120 +.... = .....;
21^2 = .....+ 40 +...... =.... .
15^2 = ......+ 100 +...... = ....;
16^2 = .....+ 120 +.... = .....;
21^2 = .....+ 40 +...... =.... .
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