307﹣299= += ×0.63= A﹣A=
5.2﹣0.6= ÷= ×= 4.25×4=
62+48=
905﹣260= =
= =
1.25×2.5×32= 8÷0.01=
808÷88≈ 697+296≈
= = = =
0.25= 0.76÷0.4= 1.6×12%= 1﹣4÷8=
3.14×11= 5.06+1.2= 0.9×99+0.9= =