Question

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Answer 1

\(1.\)

\(a.4,15+1,58+6,85-2,58\)

\(=\left(4,15+6,85\right)+\left(1,58-2,58\right)=11+\left(-1\right)=10\)

\(b.15,13.\left(-4,5\right)+15,13.\left(-6,5\right)+15,13\)

\(=15,13.\left[\left(-4,5\right)+\left(-6,5\right)+1\right]=15,13.\left(-10\right)=-151,3\)