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3/7 × 49/9 - 4/3
=7/3-4/3
=1
8/9 ×5/12+ 1/27
=10/27+1/27
=11/27
12× 5/6 – 2/9 ×3
=10-2/3
=9又1/3
8× 5/4 + 1/4
=10+1/4
=10又1/4、
6÷ 3/8 – 3/8 ÷6
=16-1/16
=15又15/16
4/7 × 5/9 + 3/7 × 5/9
=(4/7+3/7)×5/9
=1×5/9
=5/9
5/2 -( 3/2 + 4/5 )
=5/3-3/2-4/5
=1-4/5
=1/5
7/8 + ( 1/8 + 1/9 )
=7/8+1/8+1/9
=1+1/9
=1又1/9
9 × 5/6 + 5/6
=(9+1)×5/6
=10×5/6
=25/3
3/4 × 8/9 - 1/3
=2/3-1/3
=1/3
(1/2+1/3-1/5)×30
=1/2×30+1/3×30-1/5×30
=15+10-6
=19
=7/3-4/3
=1
8/9 ×5/12+ 1/27
=10/27+1/27
=11/27
12× 5/6 – 2/9 ×3
=10-2/3
=9又1/3
8× 5/4 + 1/4
=10+1/4
=10又1/4、
6÷ 3/8 – 3/8 ÷6
=16-1/16
=15又15/16
4/7 × 5/9 + 3/7 × 5/9
=(4/7+3/7)×5/9
=1×5/9
=5/9
5/2 -( 3/2 + 4/5 )
=5/3-3/2-4/5
=1-4/5
=1/5
7/8 + ( 1/8 + 1/9 )
=7/8+1/8+1/9
=1+1/9
=1又1/9
9 × 5/6 + 5/6
=(9+1)×5/6
=10×5/6
=25/3
3/4 × 8/9 - 1/3
=2/3-1/3
=1/3
(1/2+1/3-1/5)×30
=1/2×30+1/3×30-1/5×30
=15+10-6
=19
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