.,1、2的乘法口诀,练习,.,一六,二,一五,一二,九,一一,.,四,三,一,七,一八,五,一四,.,3,3,9,8,4,2,10,9,.,一二得二,12=2,21=2,17=7,71=7,.,15=5,51=5,一五得五,一三得三,13=3,31=3,.,1,6,6,6,1,6,.,1,8,8,8,1,8,.,10,3,8,6,8,5,16,10,12,11,6,6,8,4,16,14,.,6,6,=,2,3,6,6,=,4,6,4,4,=,2,4,.,5,2,5,+,5,=,10,52=10,25=10,.,62=12(只),24=8(根),8,.,得六,得三,得二,得四,一五,一八,十六,二九,十八,十四,二三,一三,.,14,6,4,3,6,2,10,6,.,6,2,12,二六十二,5,2,10,二五一十,.,+,+,+,+,.,一三得三,二三得六,.,2+2=4,22=4,二二得四,.,2+2+2=6,23=6,二三得六,.,27=14,7+7=14,22=4,2+5=7,25=10,.,2+2+2+2+2+2+2+2+2=18,9,2,2,9,.,3,2,2,2,3,1,1,1,.,4,6,8,12,.,24=8(只),8-3=5(只),.,6+6=12(米),62=12(米),12,