August 2018 1 21 Report
A) a5×b7×c×a9×b12×c15×abc=
b) x5×(-y)3×x7×x4×(-y)10×(-y)=
c) (n10÷n7)×(n12÷n8)÷(n15÷n9)=
d) a20÷[a15×(a13÷a9)÷(a2×a12)]=

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