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×(2×3-1×2)=2,
×(3×4-2×3)=3,
×(4×5-3×4)=4,
由上述事实你能得出怎样的结论?
观察×(1×2-0×1)=1,
×(2×3-1×2)=2,
×(3×4-2×3)=3,
×(4×5-3×4)=4,