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20 x 40 + 20 x 60
= 20 x ( 40 + 60 )
= 20 x 100
= 2000
tk mk nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
\(10+20+30+40+50+60+70+80+90+100\)
\(=\left(10+90\right)+\left(20+80\right)+\left(30+70\right)+\left(40+60\right)+100+50\)
\(=100+100+100+100+100+50\)
\(=550\)
= ( 10 + 90 ) + ( 20 + 80) + ( 30 + 70 ) + ( 40 + 60 ) + 50 + 100
= 100 + 100 + 100 + 100 + 50 + 100
= 100 x 5 + 50
= 500 + 50
= 550
tk nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
=123 x ( 345 + 354 + 567 + 576 +1 )
=123 x 1843
= 226689
k nha
123 x 345 + 123 x 354 + 123 x 567 + 123 x 576 + 123
=123x(345+354+567+576+1)
=123x1843
=226689
![](https://rs.olm.vn/images/avt/0.png?1311)
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9
= (1 + 9) + (2 + 8) + (3 + 7) + (4 + 6) + 5
= 10 + 10 + 10+ 10 + 5
= 45
10 + 20 + 30 + 40 + 50 + 60 + 70 + 80 + 90
= (10 + 90) + (20 + 80) + (30 + 70) + (40 + 60) + 50
= 100 + 100 + 100 + 100 + 50
= 450
1237 + 2249 + 1763 + 2251
= (1237 + 1763) + (2249 + 2251)
= 3000 + 4500
= 7500
1+2+3+4+5+6+7+8+9= 45
10+20+30+40+50+60+70+80+90 = 450
1237+2249+1763+2251 = 7500
Tích là:
40 * 50 * 60 = 120000
Đáp số:120000
120000