[tex]x = 150 + 40 + 10 = 200 \\ y = 5 + 9 - 4 = 10 \\ z = 121 - 20 - 1 = 100[/tex]
a) x-10×y-z
[tex]200 - 10 \times 10 - 100 = 200 - 100 - 100 = 0[/tex]
b) 3×x-2×y+5×z
[tex]3 \times 200 - 2 \times 100 + 5 \times 10 = 600 - 200 + 50 = 450[/tex]
c) x+y+z+10×x×y×z
[tex]200 + 10 + 100 + 10 \times 200 \times 10 \times 100 = 200 + 10 + 100 + 2000 \times 1000 = 200 + 10 + 100 + 2000000 = 2000310[/tex]
d) 10×x-y×z+x×y=
[tex]10 \times 200 - 100 \times 10 + 200 \times 100 = 2000 - 1000 + 20000 = 1000 + 20000 = 21000[/tex]