① ② ③
④ ⑤ ⑥
x-x=15 40%:x=0.2:4.5 25(x+13)=650
÷8=
20×75%=
×=
-=
1.8÷0.18=
0.8÷=
74%-63%=
÷25%=
0.4×25%=
0.27+0.73=
0.5÷0.01=
0.99÷0.11=
6-6÷7=