Выполните вычитание: 1) 7/8–(–3/10) 2)11/12–17/18 - вопрос №35759411783102111217183379144593 от tumoannasehko 20.10.2020 16:38

Question

Математика: Выполните вычитание: 1) 7/8–(–3/10) 2)11/12–17/18 3)–3/7–9/14 4)–5/9–(–3/4) 5)311/12–(–44/9) 6)45/17–6 7)13/8–31/4 8)–214/15–119/45 9)–31/6–(–11/4).

tumoannasehko · Answer

1) 7/8–(–3/10)=7/8+3/10=35/40+12/40=47/40=1 7/40
2)11/12–17/18=33/36-34/36=-1/36
3)–3/7–9/14=-6/14-9/14=-15/14=-1 1/14
4)–5/9–(–3/4)=-5/9+3/4=-20/36+27/36=7/36
5)3 11/12–(–44/9)=311/12+44/9=25 11/12+4 8/9=25 33/36+4 32/36=29 65/36=30 29/36
6)45/17–6=2 11/17-6=11/17-4=-3 6/17
7)13/8–31/4=1 5/8-7 3/4=1 5/8-7 6/8=1 -7 1/8=-6 1/8
8)–214/15–119/45=- 14 4/15- 2 29/45=-14 12/45-2 29/45=-16 41/45
9)–31/6–(–11/4).=-5 1/6+2 3/4=-5 2/12+2 9/12=-3 2/12+9/12=-3+7/12=-2 5/12