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Tính :
A = 1 + 2 + 3 + 4 + 5 + 5 + 6 + 7 + 8 + 9 + 10
A = ( 1 + 9 ) + ( 2 + 8 ) + ( 3 + 7 ) + ( 4 + 6 ) + ( 5 + 5 ) + 10
A = 10 + 10 + 10 + 10 + 10 + 10
A = 60
B = 10 + 20 + 30 + 40 + 50 + 50 + 60 + 70 + 80 + 90 + 100
B = ( 10 + 90 ) + ( 20 + 80 ) + ( 30 + 70 ) + ( 40 + 60 ) + ( 50 + 50 ) + 100
B = 100 + 100 + 100 + 100 + 100 + 100
B = 600
\(10+20+30+40+50+60+70+80+90+100\)
\(=\left(10+90\right)+\left(20+80\right)+\left(30+70\right)+\left(40+60\right)+100+50\)
\(=100+100+100+100+100+50\)
\(=550\)
= ( 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
10 + 20 + 30 + 40 + 50 + 60 + 70 + 80 + 90
= ( 10 + 90 ) + ( 20 + 80 ) + ( 30 + 70 ) + ( 40 + 60 ) + 50
= 100 + 100 + 100 + 100 + 50
= 100 x 4 + 50
= 400 + 50
= 450
Học tốt #
10+20+30+40+50+60+70+80+90+100
=(10+100)+(20+90)+(30+80)+(40+70)+(50+60)
= 110+110+110+110+110
=110x5
=550
a, 10 x 7 = 70
20 x 4= 80
40 x 2 = 80
30 x 3= 90
b, 60:=2=30
70:7=10
90:3=30
40:2=20
a) 10 x 7=70
20 x 4=80
40 x 2=80
30 x 3=9-
b) 60:2=30
90:3=30
70:7=10
40:2=20
(1+29)+(2+28)+(3+27)+(4+26)+(5+25)+(6+24)+(7+23)+(8+22)+(9+21)+(10+20)+(11+19)+(12+18)+(13+17)+(14+16)+15
=30+30+30+30+30+30+30+30+30+30+30+30+30+30+15
=30x14+15
=435
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