×4 9× ×9 ×
× = 2.1× = × = + = + ×0=
× = - × = 2- = ×2.4= ( + )×27=
× × × ×
×3 × × × ×
÷ × ÷ × ÷
×=
×=
× = 4÷0.8= 3﹣ = 0.23=
÷ = 786﹣298= 25×0.7×4= 8.7+7=
( ﹣0.375)÷ = × ÷ × =