27✖️32 54✖️84的简便方?
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27×32
=(30-3)×(30+2)
=30×30+30×2-3×30-3×2
=30×(30+2-3)-6
=30×(27+3+2-3)-6
=30×[27+2+(3-3)]-6
=30×29-6
=30×(30-1)-6
=30×30-30×1-6
=900-30-6
=870-6
=864
54×84=4536
=(100-46)×(100-16)
=100×100-100×16-46×100+46×16
=100×(100-16-46)+(40+6)×(10+6)
=100×[100-(16+46)]+40×10+40×6+6×10+6×6
=100×(100-62)+400+240+60+36
=100×38+640+96
=3800+600+40+100-4
=4400+100+40-4
=4500+36
=4536
=(30-3)×(30+2)
=30×30+30×2-3×30-3×2
=30×(30+2-3)-6
=30×(27+3+2-3)-6
=30×[27+2+(3-3)]-6
=30×29-6
=30×(30-1)-6
=30×30-30×1-6
=900-30-6
=870-6
=864
54×84=4536
=(100-46)×(100-16)
=100×100-100×16-46×100+46×16
=100×(100-16-46)+(40+6)×(10+6)
=100×[100-(16+46)]+40×10+40×6+6×10+6×6
=100×(100-62)+400+240+60+36
=100×38+640+96
=3800+600+40+100-4
=4400+100+40-4
=4500+36
=4536
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