计算下列各题．（能简算的要简算）．
91÷2.6÷0.05=         6.3×3.7+6.3×6.3=      （3.7+1.7×0.4）÷2.5=
7.28+3.2÷2.5=         0.74+0.9×7.4=           7.8÷0.125÷0.8=