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．
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