(270:у-2)×30=7×120
(270:у-2)×30=840
(270:у-2)=840:30
(270:у-2)=28
270:у=28+2
270:у=30
у=270:30
у=9
8м7см<91dm, 2km80m<2800m, 1t70z<1t800kg, 9z30kg<950kg,
26*18+26*17+14*35=26*(18+17)+14*35=26*35+14*35=35*(26+14)=35*40= 1400
6/15 = 6*6 / 15*6 = 36/90 и 11/18 = 11*5 / 18*5 = 55/90
4/15 = 4*4 / 15*4 = 16/60 и 3/20 = 3*3 / 20*3 = 9/60
2/77 = 2*4 / 77*4 = 8/308 и 3/44 = 3*7 / 44*7 = 21/308
4/49 = 4*9 / 49*9 = 36/441 и 5/63 = 5*7 / 63*7 = 35/441
Да реление правильноо....................