9.99*0.13-0.111*2.7巧算
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9.99*0.13-0.111*2.7巧算
9.99*0.13-0.111*2.7
=9.99x0.13-0.111x9x0.3
=9.99x0.13-0.999x0.3
=9.99x0.13-9.99x0.03
=9.99x(0.13-0.03)
=9.99x0.1
=0.999
=9.99x0.13-0.111x9x0.3
=9.99x0.13-0.999x0.3
=9.99x0.13-9.99x0.03
=9.99x(0.13-0.03)
=9.99x0.1
=0.999