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47²-47*46=47(47-46)=47

93²-93*92=93(93-92)=93

$57:\frac{9}{11}+33*\frac{11}{9}=\frac{11*57}{9}+\frac{33*11}{9}=\frac{11(57+33)}{9}=\frac{11(90)}{9}=110$

$\frac{7*9}{8}+\frac{5*9}{8}-\frac{9}{2}=\frac{63}{8}+\frac{45}{8}-\frac{36}{8}=\frac{72}{8}=9$

$\frac{7}{81}+\frac{5}{81}-\frac{1}{27}=\frac{7+5-3}{81}=\frac{1}{9}$

$\frac{87*35-81*35}{37*28+28^2}=\frac{(87-81)35}{(37+28)28}=\frac{6*35}{75*28}=\frac{2*3*5*7}{5*3*5*7*4}=\frac{1}{10}$

$\frac{15^2+15*13}{71*49-11*49}=\frac{15(15+13)}{(71-11)49}=\frac{15*28}{60*49}=\frac{15*4*7}{15*4*7*7}=\frac{1}{7}$

1,5*2,2*2=3*2,2=6,6

6,54*0,25*4=6,54*1=6,54

50*18,8*0,2=10*18,8=188

2,5*0,0034*400=1000*0,0034=3,4

0,8*0,125*(4*25)=0,8*0,125*100=8*1,25=10