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4/3*5/4*6/5*7/6*8/7*9/8=9/3=3 Ответ:3
(3/3+1/3)*(4/4+1/4)*(5/5+1/5)*(6/6+1/6)*(7/7+1/7)*(8/8+1/8)=4/3*5/4*6/5*7/6*8/7*9/8=5/3*6/5*8/6*9/8=6/3*9/6=9/3=3; 84x+96y+16x-58y=100x+40y; 100*4+40*3=520;