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21 + 22 + 23 + 24 + 25 + 26 + 27 + 28 + 29 + 30
= (21 + 30) + (22 + 29) + (23 + 28) + (24 + 27) + (25 + 26)
= 51 + 51 + 51 + 51 + 51
= 51 x 5
= 255
=(21+29)+(22+28)+(23+27)+(24+26)+25+30
=50+50+50+50+25+30
=200+25+30
=225+30
=255
![](https://rs.olm.vn/images/avt/0.png?1311)
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30 =465
![](https://rs.olm.vn/images/avt/0.png?1311)
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37
=(1+37)x37:2
=703
![](https://rs.olm.vn/images/avt/0.png?1311)
1*2*3*4*5*6*7*8*9*10*11*12*13*14*15*16*17*18*19*0*20*21*22*23*24*25*26*27*28*29*30*31*32=0
![](https://rs.olm.vn/images/avt/0.png?1311)
19+24+35+76557+27+27+82+72+78+27+2+7+2+72+7+2+782+7+78+652+78+27+2+78+52+3627+8+627=83058
Chúc học tốt!
![](https://rs.olm.vn/images/avt/0.png?1311)
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=1275
![](https://rs.olm.vn/images/avt/0.png?1311)
27 x 129 - 29 x 27 + 100 x 73
= 27 x ( 129 - 29 ) + 100 x 73
=27 x 100 + 100 x 73
=100 x (27 + 73 )
= 100 x 100
= 10000
k mình nha
I love you
\(27.\left(129-29\right)+100.73\)
\(27.100+100.73\)
\(100.\left(27+73\right)\)
\(100.100=10.000\)
tích ak
![](https://rs.olm.vn/images/avt/0.png?1311)
27+29=56
21+72=93
Chúc bạn hok tốt nha!@
27 + 29 = 56
21 + 72 = 93