11 + 23 + 34 + 1 + 2 + 3 = ?
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Tính nhanh ( Giúp mình nha )
a) -3/7 + 15/26 - ( 2/13 - 3/7 )
b) 2.3/7 + (2/9 -1 3?7 ) -5/3 :1/9
c) -11/23* 6/7 +8/7 * -11/23 - 1/23
d)(377/-231-123/89+ 34/791) * (1/6 -1/8-1/24)
- Kasamita :)))
(11/11×12+11/12×23+11/23×34+....+11/89×100)+x=2/3
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Tính nhanh:
a) 2.dfrac{3}{7}+left(dfrac{2}{9}-1dfrac{3}{7}right)-dfrac{5}{3}:dfrac{1}{9}
b) dfrac{-11}{23}.dfrac{6}{7}+dfrac{8}{7}.dfrac{-11}{23}-dfrac{1}{23}
c) left(dfrac{377}{-231}-dfrac{123}{89}+dfrac{34}{791}right).left(dfrac{1}{6}-dfrac{1}{8}-dfrac{1}{24}right)
d) 19dfrac{5}{8}:dfrac{7}{12}-15dfrac{1}{4}:dfrac{7}{12}
e) dfrac{2}{5}.dfrac{1}{3}-dfrac{2}{15}:dfrac{1}{5}+dfrac{3}{5}.dfrac{1}{3}
Đọc tiếp
Tính nhanh:
a) \(2.\dfrac{3}{7}+\left(\dfrac{2}{9}-1\dfrac{3}{7}\right)-\dfrac{5}{3}:\dfrac{1}{9}\)
b) \(\dfrac{-11}{23}.\dfrac{6}{7}+\dfrac{8}{7}.\dfrac{-11}{23}-\dfrac{1}{23}\)
c) \(\left(\dfrac{377}{-231}-\dfrac{123}{89}+\dfrac{34}{791}\right).\left(\dfrac{1}{6}-\dfrac{1}{8}-\dfrac{1}{24}\right)\)
d) \(19\dfrac{5}{8}:\dfrac{7}{12}-15\dfrac{1}{4}:\dfrac{7}{12}\)
e) \(\dfrac{2}{5}.\dfrac{1}{3}-\dfrac{2}{15}:\dfrac{1}{5}+\dfrac{3}{5}.\dfrac{1}{3}\)
Tính nhanh:a) 2.frac{3}{7}+left(frac{2}{9}-1frac{3}{7}right)-frac{5}{3}:frac{1}{9} b) frac{-11}{23}.frac{6}{7}+frac{8}{7}.frac{-11}{23}-frac{1}{23} c )left(frac{377}{-231}-frac{123}{89}+frac{34}{791}right).left(frac{1}{6}-frac{1}{8}-frac{1}{24}right) d) 19frac{5}{8}:frac{7}{12}-15frac{1}{4}:frac{7}{12} e) frac{2}{5}.frac{1}{3}-frac{2}{15}:frac{1}{5}+frac{3}{5}.frac{1}{3}
Đọc tiếp
Tính nhanh:
a) \(2.\frac{3}{7}+\left(\frac{2}{9}-1\frac{3}{7}\right)-\frac{5}{3}:\frac{1}{9}\)
b) \(\frac{-11}{23}.\frac{6}{7}+\frac{8}{7}.\frac{-11}{23}-\frac{1}{23}\)
c )\(\left(\frac{377}{-231}-\frac{123}{89}+\frac{34}{791}\right).\left(\frac{1}{6}-\frac{1}{8}-\frac{1}{24}\right)\)
d) \(19\frac{5}{8}:\frac{7}{12}-15\frac{1}{4}:\frac{7}{12}\)
e) \(\frac{2}{5}.\frac{1}{3}-\frac{2}{15}:\frac{1}{5}+\frac{3}{5}.\frac{1}{3}\)
a: \(=\dfrac{17}{7}+\dfrac{2}{9}-\dfrac{10}{7}-\dfrac{5}{3}\cdot9=1+\dfrac{2}{9}-15=-14+\dfrac{2}{9}=-\dfrac{126}{9}+\dfrac{2}{9}=-\dfrac{124}{9}\)
b: \(=\dfrac{-11}{23}\left(\dfrac{6}{7}+\dfrac{8}{7}\right)-\dfrac{1}{23}=\dfrac{-22}{23}-\dfrac{1}{23}=-1\)
c: \(=\left(\dfrac{377}{-231}-\dfrac{123}{89}+\dfrac{34}{791}\right)\cdot\dfrac{4-3-1}{24}=0\)
d: \(=\dfrac{12}{7}\left(19+\dfrac{5}{8}-15-\dfrac{1}{4}\right)=\dfrac{12}{7}\cdot\dfrac{35}{8}=\dfrac{15}{2}\)
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(3.x+9).(11-x) =0
23.(x. 23)=34
3.|x+1| +5=17
(x-3).(x+5)+x đk : x=2
Ai lm sớm giúp mk mk tik cho ạ
(3.x+9).(11-x) =0
\(\Rightarrow\orbr{\begin{cases}3x+9=0\\11-x=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=-3\\x=11\end{cases}}}\)
23.(x. 23)=34
\(x23=\frac{34}{23}\)
\(x=\frac{34}{529}\)
3.|x+1| +5=17
\(\text{3.|x+1|}=12\)
\(\text{|x+1|}=4\)
\(\Rightarrow\orbr{\begin{cases}x+1=4\\x+1=-4\end{cases}\Leftrightarrow\orbr{\begin{cases}x=3\\x=-5\end{cases}}}\)
(x-3).(x+5)+x đk : x=2
\(\Rightarrow\left(2-3\right).\left(2+5\right)+2\)
\(=\left(-1\right).7+2=-5\)
học tốt
(3.x+9).(11-x) =0
\(\Rightarrow\orbr{\begin{cases}3x+9=0\\11-x=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=-3\\x=11.\end{cases}}}\)
Vậy x=-3 hoặc x=11
23.(x. 23)=34
x. 23 =34:23
x. 23 =\(\frac{34}{23}\)
x =\(\frac{34}{23}:23\)
x =\(\frac{34}{529}\)
Vậy.......................
3|x+1|+5=17
3|x+1|=17-5
3|x+1|=12
|x+1|=12:3
|x+1|=4
\(\Rightarrow\orbr{\begin{cases}x+1=4\\x+1=-4\end{cases}\Leftrightarrow\orbr{\begin{cases}x=4-1=3\\x=-4-1=-5\end{cases}}}\)
Vậy x=3 hoặc x=-5
(x-3).(x+5)+x đk : x=2
Thay x=2 vào (x-3).(x+5)+x ,ta được:
(2-3).(2+5)+2
=-1.7+2
=-7+2
=-5
4.24.5^2-(3^3.18+3^3.12)
31.15.7^2.4-31.49.40
1+2+3+4+5+6+7+8+9+10
1+3+5+7+9+11+13+15+19
2+6+10+14+22+23+26+34
5+8+11+14+17+20+23+26+29
1+6+11+16+21+26+31+36+41+47+51
10+13+16+19+22+25+28+31+34+37+40
5+7+9+11+13+15+17+3+8+13+18+23+28
4+7+10+13+16+19+5+9+13+17+21+25
4.24.52-(33.18+33.12)
=4.24.25-[27.(18+12)]
=(4.25).24-[27.30]
=100.24-810
=2400-810
=1590
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4.24.5^2-(3^3.18+3^3.12)
31.15.7^2.4-31.49.40
1+2+3+4+5+6+7+8+9+10
1+3+5+7+9+11+13+15+19
2+6+10+14+22+23+26+34
5+8+11+14+17+20+23+26+29
1+6+11+16+21+26+31+36+41+47+51
10+13+16+19+22+25+28+31+34+37+40
5+7+9+11+13+15+17+3+8+13+18+23+28
4+7+10+13+16+19+5+9+13+17+21+25 = 1590
#HT#
a,-3/7+15/26-(2/13-3/7)
b,2×3/7+(2/9-1 3/7)-5/3:1/9
c,-11/23×6/7+8/7×-11/23-1/23
d,(377/-231-123/89+34/791)×(1/6-1/8-1/24)
Giúp em với ạ , em đag cần gấp...
a: \(=\dfrac{-3}{7}+\dfrac{15}{26}-\dfrac{2}{13}+\dfrac{3}{7}=\dfrac{15}{26}-\dfrac{4}{26}=\dfrac{11}{26}\)
b: \(=\dfrac{6}{7}+\dfrac{2}{9}-\dfrac{10}{7}-5=\dfrac{-4}{7}-5+\dfrac{2}{9}=-\dfrac{337}{63}\)
c: \(=-\dfrac{11}{23}\left(\dfrac{6}{7}+\dfrac{8}{7}\right)-\dfrac{1}{23}=\dfrac{-22}{23}-\dfrac{1}{23}=-1\)
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Tìm x biết:
11 / 23*34 + 11 / 34*45 + ...+11 / 90*101 + x = -1 / 101
Tính tổng 1/3+3/11+5/111+ 5/31 + 23/37 + 193/34