5.28x4·4+5·28x5·6=5.28x（4.4+5.6）=5.28x10=52.8回答完毕~ 有疑问请追问~无疑问请点击【采纳】~ 祝学习进步\(^o^)/................
5.28*（4.4+5.6）=5.28*10=52.8
52.8解析：5.28×4.4+5.28×5.6=5.28×(4.4+5.6)=5.28×10=52.8
