A)9/10×5/12=3/2×1/4=3/8
Б)3/5:11/5=3/11
В)21/22×2/5=21/11×1/5=21/55
Г)7/8:7/16=2
Д)1,3/5×2,1/2=8/5×5/2=4
Е)1,3/4:10,1/2=7/4:21/2=1/6
A)9/10×5/12=3/2×1/4=3/8
Б)3/5:11/5=3/11
В)21/22×2/5=21/11×1/5=21/55
Г)7/8:7/16=2
Д)1,3/5×2,1/2=8/5×5/2=4
Е)1,3/4:10,1/2=7/4:21/2=1/6