解: 8.12×48+5.2×81.2等于( 812)
∵已知需求出8.12×48+5.2×81.2等于多少
A × B + A × C = A × (B + C)
∴8.12 × 48 + 5.2 × 81.2
= 8.12 × (48 + 5.2 × 10)
= ( 8×100+12)/100 × (48 + 52)
= 812/100 × 100
= 812
答: 8.12×48+5.2×81.2等于812
简便计算
8.12×48+5.2×81.2
=81.2x4.8+5.2x81.2
=81.2x(4,8+5,2)
=81.2x10
=812
8.12✖48+5.2✖81.2
=8.12✖48+52✖8.12
=8.12✖(48+52)
=8.12×100
=812