□.5×□.8的积是两位小数
□.9÷□.3的商是整数
0.25﹣0.18=
3 ×4=
0.3×400=
39.5÷8=
×10=
÷ =
52=
268+332=
①( + + )÷
②12.7×99+12.7
③16.8÷[32×(1﹣ )]
①0.75x+3×0.8=7.5
② x+ x=3.5
③42: =x: