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b)
c)
d)
e)
f)
( 3/4 - 1/5 ) : 1/2 = ( 15/20 - 4/20 ) : 1/2 = 11/20 * 2/1 =1,1
b)
3,2 : ( 0,8-0,4 )= 3,2 : 0,4=8
c)
2/3 * ( 1/2 - 1/6 ) = 2/3 * ( 3/6 - 1/6 )= 2/3 * 2/6 = 4/18 = 2/9
d)
( 1 - 7/9 ) * ( 5,2 - 0,7 )= 2/9 * 4,5= 2/9 * 45/10 = 90/90 = 1
e)
123:10+0,2*6,1=12,3+1,22=13,52
f)
( 1,5 - 1 1/3 ) * 12/5 - 1/10= ( 3/2 - 4/3 ) * 12/5 - 1/10 = ( 9/6 - 8/6 ) * 12/5 - 1/10 = 1/6 * 12/5 - 1/10 = 2/5 - 1/10 = 4/10 - 1/10 = 3/10 = 0,3
PS: Sorki za takie rozwiązanie ale nie ogarniam tego programu co tak ładnie pisze te ułamki