15+0= 67+6= 45+6= 87+0= 77+22= 00+0= 55+33= 90+7= 76+2= 44+55= 11+33= 88+22= 99+0= 15+5= 44+9= 51+0= 23+23= 32+32=
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![](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)
1=11 2=22 3=33 4=44 5=55 6=66 7=77 8=88 .... 11=1
như đề bài cho
![](https://rs.olm.vn/images/avt/0.png?1311)
1+2+3+4+5+6+7+8+9=45
10+20+39+40+50+60+70+80+90=459(Chắc bạn bấm nhầm 30->39)
11+22+33+44+55+66+77+88+99=495
![](https://rs.olm.vn/images/avt/0.png?1311)
11+22=33
22+33=55
33+44=77
44+55=99
55+66=121
66+77=143
77+88=165
88+99=187
99+100=199
11+22=33
22+33=55
33+44=77
44+55=99
55+66=121
66+77=143
77+88=165
88+99=187
99+100=199
chúc bn hok tốt
tk+kb vs mk nha m.n!
c.ơn m.n nhìu!
![](https://rs.olm.vn/images/avt/0.png?1311)
11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99 + 00
= ( 11 + 99 ) + ( 22 + 88 ) + ( 33 + 77 ) + ( 44 + 66 ) + 55
= 110 + 110 + 110 + 110 + 55
= 110 x 4 + 55
= 440 + 55
= 495
11+99+22+88+44+66+55+00
=100+100+100+55
=355
is so easy
![](https://rs.olm.vn/images/avt/0.png?1311)
(45+75)*66+(75+45)*34
=(45+75)*(66+34)
=120*100
=12000
11+22+33+44+55+66+77+88+99:11
=11+22+33+44+55+66+77+88+9
=(11+9)+(22+88)+(33+77)+(44+66)+55
=20+110*3+55
=20+330+55
=405
Ta có :
a, (45 + 75) x 66 + (75 + 45) x 34
= (45 + 75) x (66 + 34)
= 120 x 100
= 12000
11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99 : 11
= 33 + 77 + 121 + 165 + 9
= 405
15+0= 15
67+6= 73
45+6= 51
87+0= 87
77+22= 99
00+0= 00
55+33=88
90+7= 97
76+2= 78
44+55= 99
11+33= 44
88+22= 110
99+0= 99
15+5= 20
44+9= 53
51+0= 51
23+23= 46
32+32=64
15+0=15 67+6=73 45+6=51 87+0=87 77+22=99 00+0=0 55+33=88 90+7=97
76+2=78 44+55=99 11+33=44 88+22=110 99+0=99 15+5=20 44+9=53 51+0=51 23+23=46
32+32=64