乘法(一)18x65=17x31=59x49=40x26=27x34=87x74=96x95=61x72=28x29 二15x11=26x83=48x93=77x67 二71x31=17x68=56x25=37x50 二56x41=98x52=49x51=乘法(二)93x31=12x38=34x43=77x6497x81 二78x89=49x15=37x1698x25=71x39=33x21=45x3718x72=69x54=50x40=63x2547x22=64x78=97x76=67x24乘法(三)76x23=66x95=60x93=69x7419x11=78x50=43x29=41x4690x83=62x94=27x76=96x9122x95=57x53=64x62=87x2058x21=84x26=13x83=95x28乘法(四)54x97 二12x31=19x48=69x3033x34 二87x48=10x24=68x4172x15=10x29=78x89=66x7413x49 二23x80=24x34=45x2014x76=52x81=55x61=31x42乘法(五)60x48=54x43=51x92=30x5183x74=36x20=12x54=11x1729x12=23x94=16x38=58x6092x73=31x58=73x69=86x6045x63=50x44=28x65=27x84乘法(六)51x28=98x40=12x77=35x9849x47=75x32=18x47=54x8053x68=67x74=31x19=72x4435x37=79x80=27x64=20x8527x73=77x47=23x75=69x50乘法(七)41x28=31x40=63x79=10x1427x55 二71x68=39x89=31x2966x80=64x10=75x4