单项选择题
A.12=6×2B.12=4×3C.12=2×2×3D.12=3×2×2
A.1.58或1.78B.1.41或1.58C.1.26或1.41D.1.12或1.26
A.12=23×31×26B.12=21×32×26C.12=32×21×26D.12=31×23×26