Решите уравнение:1,8:6,8=0,042:7/6x+0,042
18/10:68/10=42/1000×6/7x+42/1000 18/10×10/68=6/500×3x+21/500 9×1/34=3/250×3x+21/500 9/34=9/250x+21/500 8500×9/250×9/250x+8500×21/500 250×8=34×9x+17×21 2250=306x+357 -306x=-1893 x=1893/306 x=631/102