№158
5+1(7/10)=6(7/10);
2(5/12) +5(5/12)=7(10/12)
2(4/7)+3(5/7)=5(9/7)
3/8+3(1/8)=3(4/8)
4(1/2)+1/2=5
3(11/16)+1(13/16)=4(24/16)
№159
5(4/9)-5=4/9
4(2/5)-2/5=4
8(9/10)-3(3/10)=5(6/10)
1-1/7=6/7
1-1/15=14/15
1-1/12=11/12
1-2/9=7/9
1-3/11=8/11
1-5/16=11/16
3-5/9=2(4/9)
9-5(7/8)=3(1/8)
6(4/9)-3(5/9)=2(8/9)