400 - 100 =?
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
trả lời
100+100=200
200+200=400
400+400=800
học tốt nhé,k hộ
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
100+100+200+200+300+300+400+400+500+500+600+600+700+700+800 = 6400
![](https://rs.olm.vn/images/avt/0.png?1311)
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900000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000213131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\left(100+900\right)+\left(800+200\right)+...+\left(900+100\right)\)(9 cặp)
\(=1000+1000+...+1000\)(9 số 1000)
\(=1000\times9\)
\(=9000\)
k mình nha
![](https://rs.olm.vn/images/avt/0.png?1311)
100+100=200
200+200=400
300+300=600
400+400=800
K MIK NHÉ
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x + 100 = 400 - 100
x + 100 = 300
x = 300 - 100
x = 200
Vậy x = 200
Tk mk đi
Mk tk lại
x + 100 = 400 - 100
=> x + 100 = 300
=> x = 300 -100
=> x = 200
Vậy x = 200
300
Mình đầu tiên nha
x=300
cac anh chi oi xin hay tich cho em
em xin tran thanh cam on