方法一
方法二
3×9=
4×7=
8×2=
5×9=
9×4=
5×4=
2×4=
3×4=
5×7=
2×6=
3×2=
3×5=
42+( )=80 50+25= 35-6= 30+26= 5×4=
40-9= ( )×6=30 3+65= 35-6= ( )-27=54
44+33= 3×3= 26-8= 19+11= 17-5=
30+40+5= 75-30-5= 15-8+3= 4×4+4= 3×5-12=
5×6=
7×8=
6×7=
58+23=
72-34=
37+15=
88-56=
99-19=
21+34=
54+6+38=
261﹣99= 17÷34= 2.1+0.79= 80×125%=
÷36= 38.38÷38= +×0= ×3÷×3=