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minh ko biet xin loi ban nha
minh ko biet xin loi ban nha
minh ko biet xin loi ban nha
minh ko biet xin loi ban nha
a) -25+(-3).12
=[(-25).12]+(-3)
=(-300)+(-3)
=-303
b) 18.17+18.18-25.18
=18.(17+18-25)
=18.(35-25)
=18.10
=180
c) (-249)+|-145|+(-2012)+|335|+(-251)
=(-249)+145+(-2012)+335+(-251)
=[(-249)+(-251)]+(145+335)+(-2012)
=(-500)+480+(-2012)
=(-20)+(-2012)
=-2032
d) 10-11+12-13+14-15+......+2012-2013+2014
=2014-2013+2012-2011+...+15-14+13-12+11-10
=(2014-2013)+(2012-2011)+...+(15-14)+(13-12)+(11-10)
=1+1+...+1+1+1
Bạn tự tính nhóm nhé
k mk nhé câu cuối nếu cần nhắn tin mk giải cho nhé thanks các bạn
bạn nào thấy đúng k cho mk
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a,113-3+20
=1328+20
=1348
b,300+7781+1425
=9506
c,7+36-40
=43-40=3
a,
115 : 112 - 33 : ( 11 + 23 ) + 22 x 30 x 5
= 11( 5 - 2 ) - 27 : ( 1 + 8 ) + 4 x 1 x 5
= 113 - 27 : 9 + 4 x 5
= 1331 - 3 + 20
= 1328 + 20
= 1348
b,
12 x 25 + 31 x 251 + 57x 25
= 12 x 25 + 57 x 25 + 31 x 251
= ( 12 + 57 ) x 25 + 31 x 251
= 69 x 25 + 31 x 251
= 1725 + 7781
= 9506
c,
15 - 23 + 4 x 32 - 5 x 8
= 15 - 8 + 4 x 9 - 40
= 15 - 8 + 36 - 40
= 7 + 36 - 40
= 43 - 40
= 3
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25 + 5x - 43 = 251
5x - 43 = 251 - 25
5x - 43 = 226
5x = 226 - 43 = 226 - 64
5x = 162
x = 162 : 5 = 32,4
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\(25+5x-4^3=251\)
\(\Rightarrow25+5x=315\)
\(\Rightarrow5x=315-25\)
\(\Rightarrow5x=290\)
\(\Rightarrow x=290:5=58\)
\(25+x.5-4^3=251\)
\(\Rightarrow25+x.5-64=251\)
\(\Rightarrow x.5=251+64-25\)
\(\Rightarrow x.5=290\)
\(\Rightarrow x=58\)
Vậy \(x=58\)
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a)
a = 53. 571 = 53. (531 + 40) = 53. 531 + 53. 40 = 53. 531 + 53. (10.4)
= 53. 531 + (53. 10). 4 = 53. 531 + 530. 4
b = 57. 531 = (53 + 4). 531 = 531. (53 + 4) = 531. 53 + 531. 4
Vì 530 < 531 nên 530. 4 < 531. 4 do đó 53. 531 + 530. 4 < 531. 53 + 531. 4 hay a < b.
Vậy a < b.
b)
a = 25. 26 261 = 25. (26 260 + 1) = 25. 26 260 + 25. 1 = 25. (10. 2 626) + 25
= (25. 10). 2 626 + 25
= 25. 10. (26. 101) + 25 = 10. 25. 26. 101 + 25;
b = 26. 25 251 = 26. (25 250 + 1) = 26. 25 250 + 26. 1 = 26. (10. 2 525) + 26
= 26. 10. 2 525 + 26 = 26. 10. 25. 101 + 26 = 10. 25. 26. 101 + 26;
Vì 25 < 26 nên 10. 25. 26. 101 + 25 < 10. 25. 26. 101 + 26 hay a < b.
Vậy a < b.
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a) ( -125) + 100 + 80 + 125 + 20
= [ ( -125)+125] + ( 80+20) + 100
= 0 + 100 + 100 = 200
b) 27 + 55 + (-17) + ( - 55)
= [ 27+(-17)] +[ 55+(-55)]
= 10 + 0 = 10
c) (-92) + (-251) + (-8) + 251
= [ (-92) + (-8)] + [ (-251)+251]
= (-100) + 0 = -100.
d) (-31) + (-95) +131 + (-5)
= [ (-31)+131] +[ (-95)+(-5)] = 100 + (-100) = 0
e) (187 - 23) - (20-180)
= 187 - 23 - 20 + 180 = (187-180) - (23-20) = 7 - 3 = 4
g) (-50+19+143) - (-79+25+48)
= -50+19+143 + 79 - 25 - 48
= [ -50-25] + (19 + 79) + 143 - 48
= -75 + 98 + 143 - 48 = 143 - 75 + ( 98 -48)
= 68 + 50 = 118
15 - 544 = - 529
25 - 251 = - 226
Hok tốt
# MissyGirl #
15 - 544 = -529
25 - 251 = -266
hok tốt