30. Найдите значение выражений:
1) (x+4)² – (x–5)(x+5), npu x=0,5;
2) (y-5)² – (y-4)(y+4), npu y=0,8;
3) (2x-1)²-(2x-3)²+3x, npu x=1,5;
4) (3y-1)²-(3y+2)²–5y, npu y=1,2.​


помогите пожалуйста срочно нужно
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