x(x+1)+(x+1)(x+2)+(x+2)(x+3)+(x+3)(x+4)+(x+4)(x+5)+(x+5)(x+6)+(x+6)(x+7)+(x+7)(x+8)+(x+8)(x+9)+(x+9)(x+10)=1*2+2*3+3*4+4*5+5*6+6*7+7*8+8*9+9*10
ПОМОГИТЕ!!!!!
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