Решите , красной ручкой написан образец

1. (3*4)ab=12ab
2. (6*7)xy =42xy
3. (-8*9)aab=-72a^2b
4. (5*(-2))xya=-10xya
5. (6*3*0,1)xxy=1,8x^2y
6. (2*(1/2))xxa=xxa
7. (3*(-4)*(-5))yxa=60yxa
8. (-0,1*0,2*10)xy=-0,2xy
9. (2*2)xxy=4x^2y
10. (2*3*12)xyxy=72x^2y^2
11. (-4*(-1/4)*10)xya=10xya