9.99×999+9.99
=9.99*1+999*9.99
=(1+999)*9.99
=9990
7.6×7.6+7.6×3.4-7.6
=7.6*7.6+7.6*3.4-7.6*1
=(7.6+3.4+1)*7.6
=12*7.6
=91.2
（1.25+12.5+0.25）×8
=1.25*8+12.5*8+0.25*8
=10+100+1
=111
22.61+9×22.61
=1*22.61+9*22.61
=(1+9)*22.61
=10*22.61
=226.1
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