1400×(1+12%)
24÷(1-60%)÷
÷25%+4×
5.6×(480%-480%÷150%)
×2= ×1= ×0= 1.6×=
-0.5=
15×=
4÷=
90×80%=
1-23%=
1=12
1+3=22
1+3+5=32
1+3+5+7=42
1+3+5+7+…+45+47+49=.
21+23+25+…+45+47+49
=2﹣2=.
32-22=
(3+2)×(3-2)=
52-32=
(5+ 3)×(5-3)=
102-62=
(10+ 6)×(10-6)=