1
5/8+1/3=(5*3)/(8*3)+(1*8)/(3*8)=15/24+8/24=23/24
1/2-1/5=(1*5)/(2*5)-(1*2)/(5*2)=5/10-2/10=3/10
3/4+1/7=(3*7)/(4*7)+(1*4)/(7*4)=21/28+4/28=25/28
1/4+3/8=(1*2)/(4*2)+3/8=2/8+3/8=5/8
4/7-1/6=(4*6)/(7*6)-(1*7)-(6*7)=24/42-7/42=17/42
1/5+1/8=(1*8)/(5*8)+(1*5)/(8*5)=8/40+5/40=13/40
2
2/3-4/9=(2*3)/(3*3)-4/9=6/9-4/9=2/9 √
3/5+4/7=(3*7)/(5*7)+(4*5)/(7*5)=21/35+20/35=41/35 ×
7/10-3/5=7/10-(3*2)/(5*2)=7/10-6/10=1/10 ×
1/2+3/7=(1*7)/(2*7)+(3*2)/(7*2)=7/14+6/14=13/14 √ 1
5/8+1/3=(5*3)/(8*3)+(1*8)/(3*8)=15/24+8/24=23/24
1/2-1/5=(1*5)/(2*5)-(1*2)/(5*2)=5/10-2/10=3/10
3/4+1/7=(3*7)/(4*7)+(1*4)/(7*4)=21/28+4/28=25/28
1/4+3/8=(1*2)/(4*2)+3/8=2/8+3/8=5/8
4/7-1/6=(4*6)/(7*6)-(1*7)-(6*7)=24/42-7/42=17/42
1/5+1/8=(1*8)/(5*8)+(1*5)/(8*5)=8/40+5/40=13/40
2
2/3-4/9=(2*3)/(3*3)-4/9=6/9-4/9=2/9 √
3/5+4/7=(3*7)/(5*7)+(4*5)/(7*5)=21/35+20/35=41/35 ×
7/10-3/5=7/10-(3*2)/(5*2)=7/10-6/10=1/10 ×
1/2+3/7=(1*7)/(2*7)+(3*2)/(7*2)=7/14+6/14=13/14 √