能简算的要简算.
5×999+5+99×7+7+3×9+3+9 999×778+333×666
15.6×13.1﹣15.6﹣15.6×2.1 [20﹣(90.75÷6.6+2.25)]×11.6.
能简算的要简算.
5×999+5+99×7+7+3×9+3+9 999×778+333×666
15.6×13.1﹣15.6﹣15.6×2.1 [20﹣(90.75÷6.6+2.25)]×11.6.