#幼儿珠算初级阶段练习题：4以内直加直减练习 搜索结果
1+2+1=3-1+2=2+1-1+2-3=1+3-2+2-1=11+22=4-2+1=2-1+1=4-3+2-1+2=1-1+3-2+3=33-22=3+1-2=2+2-3=2-2+4-3+1=3+1-2-1+2=22+11=2-1+2=4-3+2=4-2+1-2+3=1+3-2+1-1=33-11=4-2+2=1+2-2=4-1-2+1+2=3-1+2-2+1=44-33=
