Ответы и объяснения

2014-01-10T18:22:42+04:00
№ 610: 1) 3/4+5/8=6/8+5/8=11/8=1 целая 3/8. 2) 2/5+7/15=6/15+7/15=13/15. 3) 7/16+1/4=7/16+4/16=11/16. 4) 2/7+1/3=6/21+7/21=13/21. 5) 5/18+2/3=5/18+12/18=17/18. 6) 5/6+7/8=40/48+42/48=82/48=1 целая 34/48.

№ 668: 1) 10/21-3/14=140/294-63/294=177/294=59/98. 2) 5/12-3/8=40/96-24/96=16/96=2/12=1/6. 3). 11/12-2/9=99/108-24/108=75/108=25/36. 4) 9/20-13/30=270/600-260/600=10/600=1/60. 5) 5/18-7/30=150/540-126/540=24/540=2/45. 6) 7/36-1/24=168/864-36/864=132/864=66/432=33/216=11/72