Упростить выражения: 98баллов !!!
1.(х-3)²-х(х-6)
2.(m+5)²-(m-5)
3.1-(2a-1)²
4.z²+1-(1+z)2
5.(х-2)²+(х-5)(х+7)
6.3(а-1)²+8а
7.y(y+2x)-(x+y)²
8.(b+4)²-(b-3)²
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