17+20=
45-7=
1×1=
35-(6+20)=
4×9=
8×6=
50+50=
46+(7-5)=
59-30=
2×2=
7×3=
5+5×4=
9×6=
60-8=
66+20=
37-18+25=
261﹣99= 17÷34= 2.1+0.79= 80×125%=
÷36= 38.38÷38= +×0= ×3÷×3=