×2.8 =
0.75+ =
=
0.25×23×4=
99×+× 99=
14.7-4.07=
4×÷4×=
÷0.3=
54π÷9+π=
km2 :公顷=
0.25× 80%=
0.52-0.42 =
3.6×()=
÷=
387+102= 4.8× = 18.6-5.6= 0.25×39×4=
9.6+0.1= + = 32×125%= ×8+ =