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= (11,13 + 15,17) + (13,15 + 23,25) + (17,19 + 29,31) + (21,23 + 25,27) + 27,29 + 31,33
= 26,3 + 36,4 + 46,5 + 46,5 + 27,29 + 31,33
= (26,3 + 36,4) + (46,5 + 46,5) + 27,29 + 31,33
= 62,7 + 93 + 27,29 + 31,33
= 155,7 + 27,29 + 31,33
= 182,99 + 31,33
= 214,32
11,13 + 13,15 + 15,17 + 17,19 + 19,21 + 21,23 + 23,25 + 25,27 + 27,29 + 29,31 + 31,33
= (11,13 + 31,33) + (13,15 + 29,31) + (15,17 + 27,29) + (17,19 + 25,27) + (19,21 + 23,25) + 21,23
= 42,46 x 5 + 21,23
= 212,3 + 21,23
=233,53
11,13+13,15+15,17+17,19+19,21+21,23+23,25+25,27+27,29+29,31+31,33
= ( 11,13 + 31,33 ) + ( 13,15 + 29,31 ) + ( 15,17 + 27,29 ) + ( 17,19 + 25,27 ) + ( 19,21 + 23,25 )
= 42,46 + 42,46 + 42,46 + 42,46 + 42,46
= 42,46 x 5
= 212,3
:)
11,13 + 13,15 + 15,17 + 17,19 + .....+ 31,33
= ( 11,13 + 31,33 ) + ( 13,15 + 29,31 ) + ....
= 42,46 x 5 + 21,23
= 212,3 + 21,23
= 233,53
11,13 + 13,15 + 15,17 + 17,19 + 19,21 + 21,23 + 23,25 + 25,27 + 27,29 + 29,31 + 31,33
= (11,13 + 31,33) + (13,15 + 29,31) + (15,17 + 27,29) + (17,19 + 25,27) + (19,21 + 23,25) + 21,23
= 42,46 x 5 + 21,23
= 212,3 + 21,23
= 233,53
72,69 + 18,47 - ( 8,47 - 22,69 )
= 72,69 + 18,47 - 8,47 - 22,69
= 60
Chúc bạn học tốt!
Lời giải:
$(72,69+18,47)-(8,47+22,69)$
$72,69+18,47-8,47-22,69$
$=(72,69-22,69)+(18,47-8,47)$
$=50+10=60$
a: \(60-26,75-13,25\)
\(=60-\left(26,75+13,25\right)\)
\(=60-40=20\)
b: \(38,25-18,25+21,64-11,64+9,93\)
\(=\left(38,25-18,25\right)+\left(21,64-11,64\right)+9,93\)
\(=20+10+9,93=39,93\)
c: \(45,28+52,17-15,28-12,17\)
\(=\left(45,28-15,28\right)+\left(52,17-12,17\right)\)
=30+40
=70
d: \(\left(72,69+18,47\right)-\left(8,47+22,69\right)\)
\(=72,69+18,47-8,47-22,69\)
\(=\left(72,69-22,69\right)+\left(18,47-8,47\right)\)
=50+10
=60
a) (62,87+4,13) +(35,14+4,86)+(8,35+5,65)=67+40+14=121
b) (72,69-22,69 ) +(18,47-8,47) =50+10=60
c) 11,13+13,15+15,17+17,19+...+29,31+31,33 gồm:(31,33-11,13):2,02+1=11 số
tổng:(31,33+11,13)*11:2=233,53