Odpowiedź:
2. a) (-42)-20= -62
b) 50-3×9= 50-27= 23
c) 10×2+2×2=20+4=24
d) -5×(-5)-4×(-5)= 25-(-20)= 25+20=45
e) 2×1×1×1+3×1= 2+3=5
f) 4×1/2-2=2-2=0
3. a) 5×(-4)+7×3= -20+21=1
b) -2×(-8)-6×(-2)= 16-(-12)=16+12=28
c) 2×(-1)×(-1)+3×(-5)= 2+(-15)= -13
d) -5×(-4)×(-4)-9×0= -80-0=80
e) 10×2×2-7×7+7= 40-42+7=5
