Question

Oblicz wartość wyrażenia

a)3x-2-2x+5+4x= gdy x=12

b)3a-b+5a+2b-6= gdy a=2 i b=2

c)x+2y-3y-3z+5z-x= gdy x=5 , y=8 , z=6

d)3(x-4z+y+4x-z+2y)= gdy x=1 , y=2 , z=12

Answer 1

a) 3x-2-2x+5+4x=5x+3=5*12+3=63

b)3a-b+5a+2b-6=8a+b-6=8*2+2-6=8

c)x+2y-3y-3z+5z-x=-y+2z=-8+2*6=4

d)3(x-4z+y+4x-z+2y)=3x-12z+3y+12x-3z+6y=

15x-15z+9y=15*1-15*12+9*2=15-180+18=-147

Answer 2

a) 3*12-2-2*12+5+4*12=36-2-24+5+48=63

b) 3*2-2+5*2+2*2-6=6-2+10+4-6=12

c) 5+2*8-3*8-3*6+5*6-5=5+16-24-18+30-5=4

d) 3(1-4*12+2+4*1-12+2*2)=3(1-48+2+4-12+4)=3*(-49)= -147