乘加減兩步(不進(jìn)、不退)
32+5×4= 22+6×4= 53+5×5=
72+1×3= 80+5×1= 64-9×7=
7×4+51= 4×5+25= 7×8-25=
6×6-12= 11+7×8= 78-9×7=
41+6×2= 3+9×9= 63+8×4=
3×4+10= 83+1×6= 6×5+37=
32+5×4= 22+6×4= 53+5×5=
72+1×3= 80+5×1= 64-9×7=
7×4+51= 4×5+25= 7×8-25=
6×6-12= 11+7×8= 78-9×7=
41+6×2= 3+9×9= 63+8×4=
3×4+10= 83+1×6= 6×5+37=