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1022一478一422简便计算

1022-478-422=1022-(478+422)=1022-900=122

1022-472-422=(1022-422)-472=600-472=128

1022X(580+422)=1022X1002=1022X1000+1022X2=1022000+2044=1024044

1022一422十73=600+73=673

看I类共同科目没几个咯

422x101一422=422x(101-1)=422x100=42200

99*261022-478-422=(100-1)*261022-900=26102200-261022-900=25840278

127x83一83=83x(127-1)=83x126=(80 + 3)x(125+1)=80x125+80+3x125+3=10000+80+375+3=10458

=422X87+422X14-422X1=422X(87+14-1)=422X100=42200

422x87+422x14-422x1 =422x(87+14-1)=422x100=42200

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