Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(a,1.2155-\left(174+2155\right)+\left(-68+174\right)\)
\(=2155-2155-174+174-68\)
\(=-68\)
\(b,-25.72+25.21-49.25\)
\(=25\left(-72+25-49\right)\)
\(=25.\left(-96\right)\)
\(=-2400\)
a) \(\frac{3}{8}+\frac{7}{12}+\frac{10}{16}+\frac{10}{24}\)
= \(\frac{3}{8}+\frac{7}{12}+\frac{5}{8}+\frac{5}{12}\)
=\(\left(\frac{3}{8}+\frac{5}{8}\right)+\left(\frac{7}{12}+\frac{5}{12}\right)\)
= \(\frac{8}{8}+\frac{12}{12}\)
= \(1+1\)
=\(2\)
b) \(\frac{4}{6}+\frac{7}{13}+\frac{17}{9}+\frac{19}{13}+\frac{1}{9}+\frac{14}{6}\)
= \(\frac{2}{3}+\frac{7}{13}+\frac{17}{9}+\frac{19}{13}+\frac{1}{9}+\frac{7}{3}\)
= \(\left(\frac{2}{3}+\frac{7}{3}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)+\left(\frac{17}{9}+\frac{1}{9}\right)\)
= \(\frac{9}{3}+\frac{26}{13}+\frac{18}{9}\)
= \(3+2+2\)
= \(7\)
Chúc bạn học tốt
Tính nhanh:
a, 3/8 + 7/12 + 10/16 + 10/24
= (3/8 + 10/16) + (7/12 + 10/24)
= (6/16 + 10/16) + (14/24 + 10/24)
= 16/16 + 24/24
= 1 + 1 = 2.
b, 4/6 + 7/13 + 17/9 + 19/13 + 1/9 + 14/6
= (4/6 + 14/6) + (7/13 + 19/13) + (17/9 + 1/9)
= 18/6 + 26/13 + 18/9
= 3 + 2 + 2 = 7.
a) \(\frac{3}{8}+\frac{7}{12}+\frac{10}{16}+\frac{10}{24}\)
\(=\frac{3}{8}+\frac{7}{12}+\frac{5}{8}+\frac{5}{12}\)
\(=\left(\frac{3}{8}+\frac{5}{8}\right)+\left(\frac{7}{12}+\frac{5}{12}\right)\)
\(=1+1\)
\(=2\)
b) \(\frac{4}{6}+\frac{7}{13}+\frac{17}{9}+\frac{19}{13}+\frac{1}{9}+\frac{14}{6}\)
\(=\frac{2}{3}+\frac{7}{13}+\frac{17}{9}+\frac{19}{13}+\frac{1}{9}+\frac{7}{3}\)
\(=\left(\frac{2}{3}+\frac{7}{3}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)+\left(\frac{1}{9}+\frac{17}{9}\right)\)
\(=\frac{9}{3}+\frac{26}{13}+\frac{18}{9}\)
\(=3+2+2\)
\(=7\)
1,-16+23+x=-16
=>23+x=-16-16
=>23+x=-32
=>x=-32-23
=>x=-55
2,2x-35=15
=>2x=15+35
=>2x=50
=>x=25
3,3x+17=12
=>3x=12-17
=>3x=-5
=>ko có x thỏa mãn
4,|x-1|=0
=>x-1=0
=>x=1
5,-13.|x|=-26
=>|x|=-26:-13
=>|x|=2
=>x=2 hoặc -2
1. -16+23+x=-16
23+x=(-16)-(-16)
23+x=(-16)+16
23+x=0
x=0-23
x=-23
2. 2x-35=15
2x=15+35
2x=50
x=50:2
x=25
3. 3x+17=12
3x=12-17
3x=-5
x=(-5):3
x=-5/3
4. /x-1/=0
/x/=0+1
/x/=1
=>x=1 hoặc x=-1
5. -13./x/=-26
/x/=(-26):(-13)
/x/=2
=>x=2 hoặc x=-2
\(\)35.(14-23) - 23.(14-35)
= 35.14 - 35.23 - 23.14 - (-23).35
=[(-35).23 - (-23).35] + 35.14 - 23.14
=[(-35).23 + 23.35] + 14. (35-23)
=[23. (-35+35)] + 14. 12
=[23. 0] + 168
= 0 + 168
= 168
\(\)-25.21 + 25.72 + 49.25
= 25.(-21) + 25.72 + 49.25
= 25. (-21 + 72 + 49)
= 25. 100
= 2500
\(\)27. (13-16) - 16. (13-27)
= 27.13 - 27.16 - 16.13 - (-16).27
= [ -27.16 - (-16).27 ] + 27.13 - 16.13
= [ -27.16 + 16.27 ] + 13. (27-16)
= [ 16. (-27 + 27)] + 13. 11
= [ 16. 0] + 143
= 0 + 143
= 143
-7x=21
x =21:(-7)
x =-3
b,=> x-5=9 hoặc -9
Nếu x-5=9 =>x=14
Nếu x-5=-9=>x=-4
c,-206+2015+206+(-2016)
= 1809 + (-1810)
= -1
d, (-8).(-5).16.(-125)
= 8.125.(-5).16
= 1000. (-80)
= -80000
Tìm số nguyên x, biết :
\(\left|x-3\right|-12=5\)
\(\Rightarrow\left|x-3\right|=17\)
\(\Rightarrow\orbr{\begin{cases}x-3=17\\x-3=-17\end{cases}\Rightarrow\orbr{\begin{cases}x=20\\x=-14\end{cases}}}\)
\(20-\left|x+7\right|=-12\)
\(\Rightarrow\left|x+7\right|=20-\left(-12\right)\)
\(\Rightarrow\left|x+7\right|=32\)
\(\Rightarrow\orbr{\begin{cases}x+7=32\\x+7=-32\end{cases}\Rightarrow\orbr{\begin{cases}x=25\\x=-39\end{cases}}}\)
\(-16-\left(x+5\right)=-25\)
\(\Rightarrow x+5=-16-\left(-25\right)\)
\(\Rightarrow x+5=9\)
\(\Rightarrow x=4\)
\(30-\left(x-21\right)=-20\)
\(\Rightarrow x-21=30-\left(-20\right)\)
\(\Rightarrow x-21=50\)
\(\Rightarrow x=71\)
=7/16
Trả lời rõ hơn cho mik đc ko theo từng bước í