Մաթեմատիկա դասարանական

-17/12 x (-4/7)=+17×4/12×7=+17×1/3×7=17/21

6/19×25/27=6×25/19×27 =2×25/19×9=50/171

-2/9x(-9/10)=+2×9/9×10=+2×1/1×10=2/10=1/5

24/7 x (-56/81) =-24×56/7×81=-1344/567=192/81

-42/37×15/28=-42×15/37×28=-21×15/37×14=315/518

-18 1/5 x 21/50=-18 1×21/5×50=-18 21/250

30 6/7 x 2 7/8=216/7×23/8=27×23/7×1=621/7

-6 3/10 x (-2 11/25) =63×61/10×25=3843/250

-3 3/4 x 4 91/100=-15×491/4×100=7365/400=1473/80

4/5 : 1/8 = 4/5 x 8/1 = 32/5

-5 6/7 : (-9 5/14) = 41/7 : 131/14 = 41/7 x 14/131 = 574/917

-1 9/17 : (-2/17)=26/17 x 17/2= 442/34