Упростить выражение.
(0.2a+5)^2-(0.2a-5)^2
^-перед квадратом поставил)
(0.2a+5)^2-(0.2a-5)^2
^-перед квадратом поставил)
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(0.2a+5)²-(0.2a-5)²=(0.2a+5-(0.2a-5))(0.2a+5+0.2a-5)=(0.2a+5-0.2a+5)*0.4a==10*0.4a=4a
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Задание решено...............