“9×18”有多种分拆方法,请你接着往下算。9×18=9×10+9×8==9×18=9×9+9×9==
6-3=3+3=7-5=5+2=
9-4=9-5=4+5=
10-4=10-6=4+6=
5+2=7-5=7-2=
4+1=5-1=5-4=