5)=(5/6-2/3)(5/6+2/3)=1/6·3/2=1/4.
7)=(5/12-3/4)(5/12+3/4)=(5/12-9/12)(5/12+9/12)=- 4/12·14/12= -1/3·7/6=-7/18.
9)=(8/15-4/5)(8/15+4/5)=(8/15-12/15)(8/15+12/15)= -4/15·20/15=-16/45.
11)(10/3-9/2)(10/3+9/2)= -7/6·47/6= - 329/36=-9 5/36.
13)=(51-41)(51+41)=10·92=920.
15)=(76-24)(76+24)=52·100=5200.
17)=(3 2/3-2 1/3)(3 2/3+2 1/3)=1 1/3·6=6+2=8.
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Answers & Comments
5)=(5/6-2/3)(5/6+2/3)=1/6·3/2=1/4.
7)=(5/12-3/4)(5/12+3/4)=(5/12-9/12)(5/12+9/12)=- 4/12·14/12= -1/3·7/6=-7/18.
9)=(8/15-4/5)(8/15+4/5)=(8/15-12/15)(8/15+12/15)= -4/15·20/15=-16/45.
11)(10/3-9/2)(10/3+9/2)= -7/6·47/6= - 329/36=-9 5/36.
13)=(51-41)(51+41)=10·92=920.
15)=(76-24)(76+24)=52·100=5200.
17)=(3 2/3-2 1/3)(3 2/3+2 1/3)=1 1/3·6=6+2=8.