Баллы: 14 || Упростите выражение: 2x ( x- 3 ) - 3x( x+5 ) =
( a+7 )( a -1 ) + ( a-3 )^2 =
3( y + 5 )^2 - 3y^2 =
(c + b )( c -b ) - ( 5c^2 - b^2 ) =
( c - 8 )^2 - ( 64 + 2c ) =
Примечание: ^2- во второй степени
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