脱式计算，能用简便算法的要用简便算法． 5.4×9/10+3.6÷10/9+0.9 78×3/79 6-31/4+3/4 5/9×[3/4-（7/16-1/4）] [47-（18.875-1÷8/15）]÷0.46×46/25．

①5.4×910+3.6÷109+0.9=5.4×0.9+3.6×0.9+0.9×1=0.9×（5.4+3.6+1）=0.9×10=9；②78×379=（79-1）×379=79×379−379×1=3-379=27679；③6-314+34=3+3+34-334=3+[（3+34）-334]=3；④59×[34-（716-14）]=59×...