Question

помогите даю 30 балов​

Answer 1

Ответ:

Пошаговое объяснение:

а) 3/4 ÷5/6 +2 1/2·2/5 -1÷1 1/6=3/4 ·6/5 +5/2 ·2/5 -1·6/7=(3·3)/(2·5) +1 -6/7=9/10 +1/7=63/70 +10/70=73/70=1 3/70

б) 2 3/4÷(1 1/2 -2/5)+(3/4 +5/6)÷3 1/6=2 3/4÷(1 5/10 -4/10)+(9/12+10/12)·6/19=2 3/4÷1 1/10+19/12 ·6/19=11/4 ·10/11 +1/2=5/2 +1/2=6/2=3

в) (2/15 +7/12)·30/43 -2÷2 1/2·5/32=(8/60 +35/60)·30/43 -2·2/5 ·5/32=43/60 ·30/43 -2/16=1/2 -1/8=4/8 -1/8=3/8=0,375

г) (3 1/2÷4 2/3+4 2/3÷3 1/2)·4 4/5=(7/2 ·3/14 +14/3 ·2/7)·4 4/5=(3/(2·2) +(2·2)/3)·4 4/5=(9/12 +16/12)·24/5=25/12 ·24/5=5·2=10

д) (11 5/11-8 21/22)÷1 2/3=(10 32/22-8 21/22)·3/5=2 1/2·3/5=5/2 ·3/5=3/2=1,5

е) ((1 1/2)³ -3/4) ÷7/8=((3/2)³ -3/4)·8/7=(27/8 -6/8)·8/7=21/8 ·8/7=3