((5+7):6+98)*10= (2+98)*10=100*10=1000
11/15÷3/8=11/15 × 8/3=88/45=1 43/45
6/35 ÷18/25=6/35 × 25/18=5/21
12/55÷48/77=12/55 × 77/48=7/20
21/40÷3/4=21/40 × 4/3=7/10
27/50 ÷9/25=27/50 × 25/9=3/2=1 1/2
63/64÷45/56=63/64 × 56/45=7×7/5×8=49/40=
=1 9/40
5/8 ÷ 5/32=5/8 × 32/5=4
14/55 ÷ 1/5=14/55×5/1=14/11=1 3/11
2025-1887=138 км - между любыми 2 пунктами
2025 + 138 = 2163 км -С
2163 + 138 = 2301км D
<span>8/15y-3/10y+3/5y=1/2
16y - 9y + 18y = 15
25y = 15
y = 0.6</span>