1. a) 12×2+3=24+3=27
12×(-2)+3=-24+3=-21
b) -1²+1= 1+1=2
3²+1=9+1=10
c) 8/-2= -4
8/ 1/4=8×4=32
2. a) - (1-2)/(2×2)= - (-1)/4= 1/4
b) -(1- -2)/(2× -2)= -(1+2)/-4= -3/-4= 3/4
c) -(1- -1/2)/2× -1/2)= -3/2 / -1=3/2=1 ½
d) -(1- -0,2)/2× -0,2=-0,8/-0,4=2
3. a) 11+ -1=10
b)9--1=9+1=10
c) 60/7-1=60/6=10
d)-2×-1/ 1/5=2×5=10
e) 1- 9×-1=1 - -9=1+9=10
4. a)3a+2b=3×-2+2×4=-6+8=2
b) x²+y=-1²+0,5=1+0,5=1,5
c) 3(u-v)=3(⅓- -⅔)=3(⅓+⅔)=3×1=3
d) 2p-t/4=2×-5- -¼=-10+¼=-9¾
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1. a) 12×2+3=24+3=27
12×(-2)+3=-24+3=-21
b) -1²+1= 1+1=2
3²+1=9+1=10
c) 8/-2= -4
8/ 1/4=8×4=32
2. a) - (1-2)/(2×2)= - (-1)/4= 1/4
b) -(1- -2)/(2× -2)= -(1+2)/-4= -3/-4= 3/4
c) -(1- -1/2)/2× -1/2)= -3/2 / -1=3/2=1 ½
d) -(1- -0,2)/2× -0,2=-0,8/-0,4=2
3. a) 11+ -1=10
b)9--1=9+1=10
c) 60/7-1=60/6=10
d)-2×-1/ 1/5=2×5=10
e) 1- 9×-1=1 - -9=1+9=10
4. a)3a+2b=3×-2+2×4=-6+8=2
b) x²+y=-1²+0,5=1+0,5=1,5
c) 3(u-v)=3(⅓- -⅔)=3(⅓+⅔)=3×1=3
d) 2p-t/4=2×-5- -¼=-10+¼=-9¾