(0,2²-2*0,2*0,3+0,3²)/0,5(0,9-1)= (0,2-0,3)²/0,5(-0,1)= (-0,1)²/0,5(-0,1)= -0,1/0,5= -0,2
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(0,2²-2*0,2*0,3+0,3²)/0,5(0,9-1)= (0,2-0,3)²/0,5(-0,1)= (-0,1)²/0,5(-0,1)= -0,1/0,5= -0,2