紧急召见数学高手！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

Question

如题，快！！！！！！！！！！！

Answer 1

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

Answer 2

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*99
=4.38*(1+99)
=4.38*100
=438

Answer 3

1. 原式=5.4*(5.4+4.6)
=5.4*10
=54
2.原式=2.4*（1+0.02）
=2.4+2.4*0.02
=2.4+0.048
=2.448
3.原式=4.38+4.38*10*9.9
=4.38*（1+99）
=4.38*100
=438

Answer 4

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*10+1/10+43.8*9.9
=43.8*0.1+43.8*9.9
=43.8*(0.1+9.9)
=43.8*10
=438 x

Answer 5

5.4*5.4+5.4*4.6=5.4*（5.4+4.6）=5.4*10=54
2.4*1.02=2.4*（1.00+0.02）=2.4*1.00+2.4*0.02=2.448
4.38+43.8*9.9=43.8*0.1+43.8*9.9=43.8*（0.1+9.9）=43.8*10=438