a) \(\frac{42}{-37}=-\frac{42}{37}=-\frac{37+5}{37}=-1-\frac{5}{37}\) ; \(-\frac{56}{43}=-\frac{43+13}{43}=-1-\frac{13}{43}\)

So sánh \(\frac{5}{37}\) với \(\frac{13}{43}\) thì dễ dàng được \(\frac{5}{37}< \frac{13}{43}\)

Do đó \(\frac{42}{-37}>\frac{-56}{43}\)

b) Dễ thấy \(\frac{37}{67}>0>-\frac{377}{677}\)

a) \(37-69=-32\)
b) \(-43-\left(-98\right)=55\)
c) \(-21-56=-77\)

a) -32

b) 55

c) -77

a)-32

b)55

c)-77

\(a,-13-\left(-15\right)=-13+15=2\)

\(b,43-\left(56-43\right)+\left(56-12\right)=43-13+44=30+44=74\)

\(c,4^4:2^8+\left[13-\left(-5\right)\right]\cdot\left(-3\right)=256:256+\left(13+5\right)\cdot\left(-3\right)\)\(=1+18\cdot\left(-3\right)=1+\left(-54\right)=-53\)

\(d,135\cdot\left(13-37\right)+37\cdot\left(135-13\right)=135\cdot\left(-24\right)+37\cdot122\)\(=-3240+4514=1274\)

a, -13-(-15)=-13+15=2

b, 43-(56-43)+(56-12)=43-13+44=30+44=74

c, 4^4:2^8+[13-(-5)].(-3)=256:256+(13+5).(-3)=1+18.(-3)=1+(-54)=-53

d, 135.(13-37)+37.(135-13)=135.(-24)+37.122=-3240+4514=1274

a)-13-(-15)=-13+15=2

b)43-(56-43)+(56-12)=43-56+43+56-12=43+(56-56)-12=43+0-12=43-12=31

c)=256:256+13+5.(-3)=1+18.(-3)=19.(-3)=-57

d)135.(13-37)+37.(135-13)=135.13-135.37+(37.135-37.13)=(135.13-37.135)+(135.37-37.13)=135.37-13+37.

a ) 3 10 . b ) 49 5 . c ) − 3. d ) − 15 6