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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
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+100
=(10+100)+(20+90)+(30+80)+(40+70)+(50+60)
= 110+110+110+110+110
=110x5
=550
10*10=100
10*20=200
10*30=300
10*40=400
10*50=500
10*60=600
10*70=700
10*80=800
10*90=900
10*100=1000
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
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 #
a) 90 – ( 30 – 20) = 90 – 10
= 80
90 – 30 – 20 = 60 - 20
= 40
b) 100 – (60 + 10) = 100 – 70
= 30
100 - 60 + 10 = 40 + 10
= 50
c) 135 – (30 + 5) = 135 – 35
= 100
135 – 30 – 5 = 105 – 5
= 100
d) 70 + (40 – 10) = 70 + 30
= 100
70 + 40 – 10 = 110 -10
= 100
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