Zapishite nedostsyushie 4isla a) 2/3 + 3/4 = _/12 + _/12 = _/12 b) 2/15 + 7/10 = _/30 + _/30 = _/30 v) 3/16 + 9/20 = _/_ + 36/_ = _/_ g) 5/8 + 11/12 = 15/_ + _/_ = _/_ d) 1/2 - 1/3 = _/6 - _/6 = _/6 e) 11/36 - 5/18 = _/36 - _/36 = _/36 j) 9/10 - 7/8 = _/_ - 35/_ = _/_ z) 7/22 - 3/55 = 35/_ - _/_ = _/_

2

Ответы и объяснения

2012-10-17T19:24:12+00:00

а-8 и 9 и 17

б-4 и 21 и 25

в-15 и 80 и 80 и 51 и 80

г-24 и 22 и 24 и 37 и 24

д- 3 и 2 и 1

е-11 и 10 и 1

ж- 45 и 50 и 50 и 10 и 50

з-110 и 6 и 110 29 110

 

2012-10-18T05:31:43+00:00

2/3+3/4=4*2/12+3*3/12(привести к общему знаменателю)=8/12+9/12=17/12

2/15+7/10=2*2/30+3*7/30=4/30+21/30=25/30

3/16+9/20=5*3/80+9*4/80=15/80+36/80=51/80

5/8+11/12=3*5/24+2*11/24=15/24+22/24=37/24

1/2-1/3=3*1/6-2*1/6=3/6-2/6=1/6

11/36-5/18=11/36-5*2/36=11/36-10/36=1/36

9/10-7/8=9*4/40-7*5/40=36/40-35/40=1/40

7/22-3/55=5*7/110-3*2/110=35/110-6/110=29/110