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b) (-7/3)* (-27/28)= 189/84
c)13/6 // 13/9= 13/6*9/13= 1/2*3=1 1/2
d) 3/6 + 2/6 // 1/2= 5/6 * 2/1 =5/3= 1 2/3
e) 17/12 // 3/6- 2/6= 17/12 // 1/6 = 17/12 * 6/1 = 17/2 = 8 1/2
f)5/3 // 1/2= 10/6 // 3/6= 10/6 * 6/3 = 10/3= 3 1/3
g) 6/8 + 1/8 //6/8- 1/8=7/8 // 5/8= 7/8* 8/5= 7/5= 1 2/5
h) 5/10 - 14/10 // 5/10- 12/10= - 9/10 // - 7/10 = -9/10 * (-10/7)= 9/7 = 1 2/7
i) 11/4 : 1/7 - 22 // 11 = 11/4 * 7/1 - 22//11=77/4 - 22 // 11= 19 1/4- 22/11=2 3/4/11=
= 11/4 //11=11/4* 1/11=1/4
SORY ŻE TAK DŁUGO i // - to ta " kreska ułamkowa "