五年级小学数学(每题都需要过程)第一必釆

发布网友 发布时间:2024-09-17 08:11

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热心网友 时间:2024-10-02 08:50

原式=(0.228-0.21)×(0.228-0.21+0.2003)+(0.228-0.21+0.2003)-(1+0.228- 0.21+0.2003)×(0.228-0.21)

=(0.228-0.21)×[(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)]+(0.228-0.21+0.2003)
=(0.228-0.21)×(-1)+(0.228-0.21+0.2003)
=-0.228+0.21+0.228-0.21+0.2003
=0.2003

设兔子有x只,鸡有(100-x)只
4x - 2×(100-x)= 40
解得,x=40
兔子有40只

8÷984=1÷123

热心网友 时间:2024-10-02 08:49

(1+0.228-0.21)×(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)×(0.228-0.21)
=(1+0.228-0.21)×(0.228-0.21)+(1+0.228-0.21)×0.2003 -(1+0.228-0.21)×(0.228-0.21)-0.2003×(0.228-0.21)
=(1+0.228-0.21)×0.2003-0.2003×(0.228-0.21)
=0.2003× 【(1+0.228-0.21)-(0.228-0.21)】
=0.2003×1
=0.2003

解:设兔子有x只。
4x-(100-x)×2=40
4x-200-2x=40
4x-2x-200=40
2x-200=40
2x=240
x=120

8÷984=1÷123

热心网友 时间:2024-10-02 08:57

(1)若设0.228-0.21=0.018=x
则(1+0.228-0.21)*(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)*(0.228-0.21)
=(1+x)(x+0.2003)-(1.2003+x)*x
=x+0.2003+x方+0.2003x-1.2003x-x方
=0.2003
(2)2x+40=4x(100-x)
x你要自己求咯!(忙的)
我还有事,( ^_^ )/~~拜拜,望采纳!

热心网友 时间:2024-10-02 08:49

解:设0.228-0.21=a,0.228-0.21+0.2003=b

则原式=(1+a)*b-(1+b)*a
=b+ab-a-ab
=b-a
=0.2003

2*100=200 200+40=240 兔:240/(4+2)=40

8÷984=1÷123

热心网友 时间:2024-10-02 08:50

(1).(1+0.228-0.21)×(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)×(0.228-0.21)
=(1+0.228-0.21)×(0.228-0.21)+(1+0.228-0.21)×0.2003
-(1+0.228-0.21)×(0.228-0.21)-0.2003×(0.228-0.21)
=(1+0.228-0.21)×0.2003-0.2003×(0.228-0.21)
=0.2003× 【(1+0.228-0.21)-(0.228-0.21)】
=0.2003×1
=0.2003
(2).2*100=200 200+40=240 兔:240/(4+2)=40
(3).算式:
8÷984=1÷123

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