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= ( 5 + 95 ) + ( 15 + 85 ) + ( 25 + 75 ) + ( 35 + 65 ) + ( 45 + 55 )
= 100 + 100 + 100 + 100 + 100
= 5 x 100
= 500
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15 + 25 + 35 + 45 + 55 + 65 + 75 + 85 + 95 =495 vì 495 < 500 nên 15 + 25 + 35 + 45 + 55 + 65 + 75 + 85 + 95 < 500
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25 + 25 x 3
= 25 x ( 1 + 3 )
= 25 x 4
= 100
35 + 45 + 55 + 65
= ( 35 + 65 ) + ( 45 + 55 )
= 100 + 100
= 200
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![](https://rs.olm.vn/images/avt/0.png?1311)
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A, 4655 +2033 + 2567
=4655+(2033+2567)
=4655+4600
= 9255
b, 200-5-15-25-35-45-5
= 200-(5 +15+25+35+45+55)
= 200-180
=20
k cho mình nha bạn !!!
A.4655+2033+2567
=4655+(2033+2567)
=4655+4600
=9255
B.200-5-15-25-35-45-55
=200-(5+15+25+35+45+55)
=200-180
=20
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70-65+60-55+50-45+...+20-15+10-5
=(70-65)+(60-55)+(50-45)+...+(20-15)+(10-5)
= 5 + 5 + 5 +...+ 5 + 5
= 5x7
= 35.
15 + 25 + 35 + 45 + 55 + 65 + 75 + 85
= (15 + 85) + (25 + 75) + (35 + 65) + (45 + 55)
= 100 + 100 + 100 + 100
= 400
15+25+35+45+55+65+75+85
=(15+85)+(25+75)+(35+65)+(45+55)
=100+100+100+100
=400