4.56×0.27+4.56×0.63+0.456
=4.56×(0.27+0.63+1)
=4.56×2
=9.12
5.85+6.13+3.87－1.85
=5.85－1.85+6.13+3.87
=4+10
=14
12.5×5.7×8－5.7×90
=100×5.7－5.7×90
=5.7×（100-90）
=5.7×10
=57第一题错了4.56×0.27+4.56×0.63+0.456 =4.56×(0.27+0.63+0.1)=4.56×1=4.56还有第三题第三题对的看错了，嘻嘻。不过，谢谢！