2×5= 1×4= 3×4= 2×3=
3×3= 2×4= 3×5= 4×5=
86-6= 30+45= 70-40= 39+8=
列式:
25+43+19=
80﹣19﹣32=
50﹣32+29=
14+36+17=
32+18-17=
37-18+13=
87-15-23=