Question

一道七年级数学题,各位帮帮我~谢了~会追分~

Answer 1

(m+n）的2次方=16

m^2+2mn+n^2=16 (1)

(m-n）的2次方=4

m^2-2mn+n^2=4 (2)

(1)-(2)得4mn=12

故mn=3