1)3/2 + 1/5 - 4/6
2)1/2 + 1/2 + 1/2 -1/2 -3/4
3)6/7 + 7/8 + 8/9
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1)3/2+1/5-4/6=
MMC=30
30:2.3=45
30:5.1=6
30:6.4=20
45/30+6/30-20/30
51/30-20/30=31/30
2)1/2+1/2+1/2-1/2-3/4
MMC=4
4:2.1=2
4:4.3=3
2/4+2/4+2/4-2/4-3/4
6/4-2/4-3/4
4/4-3/4=1/4
3)6/7+7/8+8/9=
MMC=378
378:7.6=324
378:8.7=330,75
378:9.8=336
324/378+330,75/378+336/378
654,75/378+336/378=990,75/378
MMC=30
30:2.3=45
30:5.1=6
30:6.4=20
45/30+6/30-20/30
51/30-20/30=31/30
2)1/2+1/2+1/2-1/2-3/4
MMC=4
4:2.1=2
4:4.3=3
2/4+2/4+2/4-2/4-3/4
6/4-2/4-3/4
4/4-3/4=1/4
3)6/7+7/8+8/9=
MMC=378
378:7.6=324
378:8.7=330,75
378:9.8=336
324/378+330,75/378+336/378
654,75/378+336/378=990,75/378
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