2/1*2+2/2*3+2/3*4+2/4*5+2/5*6+2/6*7+2/7*8 помогите пожалуйста. Created by msteamo. algebra-ru

7*8 помогите пожалуйста...

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2/1*2+2/2*3+2/3*4+2/4*5+2/5*6+2/6*7+2/7*8 помогите пожалуйста

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стояни 2*(1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8)1/1*2+1/2*3=(1*3+1)/1*2*3=4/2*3=2/32/3+1/3*4=(2*4+1)/3*4=9/3*4=3/43/4+1/4*5=(3*5+1)/4*5=16/4*5=4/54/5+1/5*6=(4*6+1)/5*6=25/5*6=5/65/6+1/6*7=(5*7+1)/6*7=36/6*7=6/76/7+1/7*8=(6*8+1)/7*8=49/7*8=7/82*(7/8)=7/4=1.25

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