(-15/18)*(-6/5)*(-3/4)*(-2/3)*(-2/7)=
1) -15/18*(-6/5)= 15*6 = 3/3=1
18*5
2) 1*(-3/4)= - 3/4
3) -3/4*(-2/3)= 3*2 = 1/2
4*3
4) 1/2*(-2/7)= - 1×2 = -1/7
2*7
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(-15/18)*(-6/5)*(-3/4)*(-2/3)*(-2/7)=
1) -15/18*(-6/5)= 15*6 = 3/3=1
18*5
2) 1*(-3/4)= - 3/4
3) -3/4*(-2/3)= 3*2 = 1/2
4*3
4) 1/2*(-2/7)= - 1×2 = -1/7
2*7