упростите выражения 1) (1,1х^2-6y )^2 -(1.1x^2 -6y)(1.1x^2+6y )
2)(2,3а -7b^3 )(2.3a +7b^3) -(2.3a +7b^3)^2
3) (3.1 n ^3-5m )^2 +(5m-3.1n^3 )(5m-3.1n^3 )
^ это степень
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