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100+200+30+300+70+700+800+900:9
=100+200+30+300+70+700+800+100
=(100+200+300+700+800+100)+(30+70)
=2300
=100+200+30+300+70+700+800+100
=(100+100)+(200+800)+(30+70)+(300+700)
=200+1000+100+1000
=2300
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100+200+300+400+500
=(100+400)+(200+300)+500
=500+500+500
=500x3
=1500
10+20+30+40+50
=(10+40)+(20+30)+50
=50+50+50
=50x3
=150
k mình nha
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a) x +60+40 =400
x = 400-40-60
x =300
b) (x+25) + 50 = 100:2 +30
(x+25) +50 = 50+30=80
x+25 = 80-50=30
x =30-25
x = 5
a.x+60+40=200
x+100=200
x=200-100
x=100
b.x+25+50=100:2+30
x+75=50+30
x+75=80
x=80-75
x=5
mk nhanh nhất
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200+ 100: 5+ 30- 70= 200+ 20+ 30- 70= 220+ 30- 70= 250- 70= 180.
200 + 100 : 5 + 30 - 70
= 200 + 20 + 30 - 70
= 220 + 30 - 70
= 250 - 70
= 180
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59
59
200
400
29+30=59 30+29=59
100+100=200 200+200=400