Пошаговое объяснение:
8. -( 3/14*21/2)=-(3/2*3/2)=-9/4=-2,25
9. +(12/1*7/6)=+(2/1*7/1)=+14
10.+(3/4*1/5)=+3/20=0.15
11.+(35/27*9/14)=+(35/3*1/14)=+35/42=+5/6
1.х=-54/9=-6
2.х=-5
3.х=-6/13
4.х=-48/21
5.х=-(25/14*7/15)=-5/6
6.х=+6,3
7.х=0.35
8.х=30
