简便计算9.9x8.6+0.86=?

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简便计算9.9x8.6+0.86=?
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简便计算9.9x8.6+0.86=?
简便计算9.9x8.6+0.86=?

简便计算9.9x8.6+0.86=?
9.9x8.6+0.86
=99*0.86+0.86
=0.86*(99+1)
=0.86*100
=86

9.9x8.6+0.86=9.9x8.6+0.1*8.6=(9.9+0.1)*8.6=86

9.9x8.6+0.86
=9.9×8.6+(0.1×8.6)
=8.6×(9.9+0.1)
=8.6×10
=86
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=(10-0.1)*8.6+0.86
=10*8.6-0.1*8.6-0.86
=86

(9.9+0.1)*8.6=86

(10-0.1)*8.6+0.86=10*8.6-0.1*8.6+0.86=86