Question

这三题肿么写要用简便计算：2.4×20.6+33.1×7.6

465×8.2+465×29.6-365×37.8
4.25×166-42.5×14.2+24×5.75

Answer 1

2.4×20.6+33.1×7.6
=2.4*20.6+33.1(10-2.4)
=331-2.4*(33.1-20.6)
=331-2.4*12.5
=331-0.3*8*12.5
=331-30
=301
465×8.2+465×29.6-365×37.8
=465*(8.2+29.6)-365*37.8
=37.8*(465-365)
=37.8*100
=3780
=
4.25×166-42.5×14.2+24×5.75
=4.25*(166-142)+24*5.75
=4.25*24+24*5.75
=24*(4.25+5.75)
=24*10
=240 .

Answer 2

2.4×20.6+33.1×7.6
=4*(0.6*20.6+33.1*1.9)
=4*[12.36+33.1*(2-0.1)]
=4*(12.36+66.2-3.31)
=4*(78.56-3.31)
=4*75.25
=4*25*3+4*0.25
=300+1
=301

465×8.2+465×29.6-365×37.8
=465*8.2+465*29.6-(465-100)*37.8
=465*8.2+465*29.6-465*37.8+37.8*100
=465*(8.2+29.6-37.8)+3780
=465*0+3780
=3780

4.25×166-42.5×14.2+24×5.75
=42.5*166-42.5*14.2+24*(10-4.25)
=42.5*16.6-42.5*14.2+240-2.4*42.5
=42.5*(16.6-14.2-2.4)+240
=42.5*0+240
=240

追问

这样算好复杂

追答

有什么办法

追问

有木有更简单点的.

追答

没有

Answer 3

( ⊙ o ⊙ )啊！
这是什么题呀
太恶了
是鬼才看得进去

追问

六年级的题...

追答

完了、小学奥数白上了

Answer 4

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