优质解答
1.3/7 × 49/9 - 4/3=7/3-4/3=3/3=1
2.8/9 × 15/36 + 1/27=10/27+1/27=11/27
3.12× 5/6 – 2/9 ×3=10-2/3=30/3-2/3=28/3
4.8× 5/4 + 1/4=10+1/4=40/4+1/4=41/4
5.6÷ 3/8 – 3/8 ÷6=6*8/3-3/8*1/6=16-1/16=155/16
6.4/7 × 5/9 + 3/7 × 5/9=1/7*(4*5/9+3)=1/7*47/9=47/63
7.5/2 -( 3/2 + 4/5 )=5/2-3/2-4/5=1-4/5=5/5-4/5=1/5
8.7/8 + ( 1/8 + 1/9 )=7/8+1/8+1/9=1+1/9=10/9
9.9 × 5/6 + 5/6=(9+1)*5/6=50/6
10.3/4 × 8/9 - 1/3=(3/4*8/3-1)*1/3=1*1/3=1/3
11.7 × 5/49 + 3/14=(7*5/7+3/2)*1/7=13/14
12.6 ×( 1/2 + 2/3 )=3+4=7
13.8 × 4/5 + 8 × 11/5=8*(4/5+11/5)=8*3=24
14.31 × 5/6 – 5/6=(31-1)*5/6=25
15.9/7 - ( 2/7 – 10/21 )=9/7-2/7+10/21=1+10/21=31/21
1.3/7 × 49/9 - 4/3=7/3-4/3=3/3=1
2.8/9 × 15/36 + 1/27=10/27+1/27=11/27
3.12× 5/6 – 2/9 ×3=10-2/3=30/3-2/3=28/3
4.8× 5/4 + 1/4=10+1/4=40/4+1/4=41/4
5.6÷ 3/8 – 3/8 ÷6=6*8/3-3/8*1/6=16-1/16=155/16
6.4/7 × 5/9 + 3/7 × 5/9=1/7*(4*5/9+3)=1/7*47/9=47/63
7.5/2 -( 3/2 + 4/5 )=5/2-3/2-4/5=1-4/5=5/5-4/5=1/5
8.7/8 + ( 1/8 + 1/9 )=7/8+1/8+1/9=1+1/9=10/9
9.9 × 5/6 + 5/6=(9+1)*5/6=50/6
10.3/4 × 8/9 - 1/3=(3/4*8/3-1)*1/3=1*1/3=1/3
11.7 × 5/49 + 3/14=(7*5/7+3/2)*1/7=13/14
12.6 ×( 1/2 + 2/3 )=3+4=7
13.8 × 4/5 + 8 × 11/5=8*(4/5+11/5)=8*3=24
14.31 × 5/6 – 5/6=(31-1)*5/6=25
15.9/7 - ( 2/7 – 10/21 )=9/7-2/7+10/21=1+10/21=31/21