b) (0,375 - 0,3 + 3/11 + 3/12)/(-0,625 + 0,5 - 5/11 - 5/12) + (1,5 + 1 - 0,75)/(2,5 + 5/3 - 1,25)
= (3/8 - 3/10 + 3/11 + 3/12)/(-5/8 + 0,5 - 5/11 - 5/12) + (3/2 + 3/3 - 3/4)/(5/2+ 5/3 - 5/4)
= 3(1/8 - 1/10 + 1/11 + 1/12)/-5(1/8 - 1/10 + 1/11 + 1/12) + 3(1/2 + 1/3 - 1/4)/5(1/2 + 1/3 - 1/4)
= -3/5 + 3/5 = 0
d) 2.5^22-9.5^21/25^10 : 5(3.7^15-19.7^14)/7^16+3.7^15
= 10.5^21-9.5^21/5^20 : 5(7^14.21-19.7^14)/7^15.7+3.7^15
= 5^21(10-9)/5^20 : 5(7^14.2)/7^15.10
= 5^21/5^20 : 7^14.10/7^15.10
= 5 : 1/7 = 35
@_@
