A) = 3/2-5*2/2+4/2=-3/3 /-корень
б) /15*/15=15
в)(5/5-3/5):/5=/5(5-3):/5=2
г)(2*5/3+6*4/3):/3=(10/3+24/3):/3=34/3:/3=34
е) x-/xy
6· 4/3-2· 3/2=8-3=5
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17/2+15/7*11/36-15/7*13/60=17/2+165/252-13/28=2142/252+165/252-117/252=2190/252=1095/126=8(целых)
87/126
=cosb*sinb/cosbsin²b - cosb*cosb/sinb=1/sinb-cos²b/sinb=(1-cos²b)/sinb=
=sin²b/sinb=sinb