99+11乘19+11乘80简便计算
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99+11乘19+11乘80简便计算
99+11乘19+11乘80简便计算
99+11乘19+11乘80简便计算
99+11乘19+11乘80
=99+11*19+11*80
=99+11*(19+80)
=99+11*99
=99*(1+11)
=99*12
=(100-1)*12
=1200-12
=1188
99+11*19+11*80
=99+11*(19+80)
=99+11*99
=99*(11+1)
=99*12
=100*12-12
=1200-12
=1188
99+11*19+11*80
=99+11*(19+80)
=99+11*99
=99*(11+1)
=99*(10+2)
=990+198
=1188