3)(-11/15)×(-10/11)×(-9/10)+(7/9)×(-6/7)+4/15

Question

3)(-11/15)×(-10/11)×(-9/10)+(7/9)×(-6/7)+4/15

Answer 1

(-11/15)×(-10/11)×(-9/10)+(7/9)×(-6/7)+4/15=
(-11×(-10)×(-9))/(15×11×10)-(6×7)/(9×7)+4/15=
(-990)/1650-(42/63)+4/15=-1