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Matrix! College mathematics, linear algebra. How to multiply matrices? Just solve my following problem.
The result is a matrix with a size of 3×3.

A 1 1=ak+bn+cq,A 12=al+bo+cr,a 13 = am+BP+cs;

A2 1=dk+en+fq,A22=dl+eo+fr,A23 = DM+EP+fs;

A3 1=hk+in+jq,A32=hl+io+jr,A33 = hm+IP+js;