十万火急!简便计算5.4*5.4+5.4*4.6、2.4*1.02和4.38+43.8*9.9如题,_数学解答

十万火急!简便计算5.4*5.4+5.4*4.6、2.4*1.02和4.38+43.8*9.9
如题,

人气：159 ℃　时间：2020-01-30 21:34:57

解答

5.4*5.4+5.4*4.6
=5.4*(5.4+4.6)
=5.4*10
=54
2.4*1.02
=2.4*(1+0.02)
=2.4*1+2.4*0.02
=2.4+0.048
=2.448
4.38+43.8*9.9
=4.38+4.38*10*9.9
=4.38+4.38*99
=4.38*(1+99)
=4.38*100
=438