1/7=8/-x
3x/9=2/6
4/2/5:(-33/10)+x=-1/5/6
(x-2/1/4):(-5/6)=3
-8:(4/1/5x+3/10)=4/4/9
(5,5x-44):(-3/2)=30
(13/10x-15).(-5/14)=3
1/3.(x+5/2)=-2
chu y dau( //)la so tap phan con dau( /) la phan so
2/25.
C)-1/4+-5/17.[1/3:20/17.
5.tính nhanh a)-3/7+5/13+-4/7
B) 5/9+7/12+4/9
C) 9/10.-7/8+9/10.-1/8
D 7/19.8/11+7/19.3/11+12/19.
6 . tim x
A) X+1/7=-2/3.
B)5/9+7/12+4/9.
C)-1/3.x5/7.
D)x:-5/9=9/10
E)x/3=2/3+-1/7.
7)qua da hau nang bao nhieu kilogam neu biet 2/3qua dau nang .1, 2 phan 3 kg?
8biet ti so phan tram nUoc tong dua cHuot la 97,2%tinh luong nuoc trong 4 kg dua chuot.
Bài 6:
a: \(x=-\dfrac{2}{3}-\dfrac{1}{7}=\dfrac{-14-3}{21}=\dfrac{-17}{21}\)
d: \(x=\dfrac{9}{10}\cdot\dfrac{-5}{9}=\dfrac{-1}{2}\)
e: \(\Leftrightarrow x\cdot\dfrac{1}{3}=\dfrac{14}{21}-\dfrac{3}{21}=\dfrac{11}{21}\)
=>x=11/7
cau 1:tinh gia tri bieu thuc
3/4 +1/1/4 *2/2/3-(-1/2)^2:6/5
cho ma co 2 dau/la hon so,con 1 dau la phan so,con ^2 la mu 2
cau 2:tim x biet
( x-1)^5= -32
cho ^5 co nghia la mu 5
a)3/4+1/1/4*2/2/3-(-1/2)^2:6/5
=3/4+5/4*8/3-1/4:6/5
=3/4+10/3-5/24=18/24+80/24-5/24=93/24=31/8
b)(x-1)^5=32=2^5
=>x-1=2
x=2+1
x=3
Bai 1
A; 8\5+7\6+5\9-2
B;3-5\6-4\9+32\24
Bai 2; Trong mot thu vien co 1\2 so sach la truyen thieu nhi 2\5 so sach la sach giao khoa con lai la cac loai sach khac tim phan so chi so sach khac
Bai3 ;viet phan so 7\8 thanh tong cua ba phan so so toi gian co mau so khac nhau
Bai4; A;x :5\4 =9\5+1\2 B;[x +3\4]* 5\7 =10\9
Bai 5 mot manh giay hinh chu nhat co chu vi la 22\3 dm chieu dai hon chieu rong 1\2 dm tinh dien tich cua manh giay do
Bài toán 3 : Tìm x, biết.
a. 2(x – 5) – 3(x + 7) = 14 b. 5(x – 6) – 2(x + 3) = 12
c. 3(x – 4) – (8 – x) = 12 d. -7(3x – 5) + 2(7x – 14) = 28
e. 5(3 – 2x) + 5(x – 4) = 6 – 4x f. -5(2 – x) + 4(x – 3) = 10x – 15
g. 2(4x – 8) – 7(3 + x) = |-4|(3 – 2) h. 8(x – |-7|) – 6(x – 2) = |-8|.6 – 50
k. -7(5 – x) – 2(x – 10) = 15 l. 4(x – 1) – 3(x – 2) = -|-5|
m. -4(x + 1) + 89x – 3) = 24 n. 5(x – 30 – 2(x + 6) = 9
o. -3(x – 5) + 6(x + 2) = 9 p. 7(x – 9) – 5(6 – x) = – 6 + 11x
q. 10(x – 7) – 8(x + 5) = 6.(-5) + 24
nhiều quá :((
\(a,2\left(x-5\right)-3\left(x+7\right)=14\)
\(2x-10-3x-21=14\)
\(-x-31=14\)
\(-x=45\)
\(x=45\)
\(b,5\left(x-6\right)-2\left(x+3\right)=12\)
\(5x-30-2x-6=12\)
\(3x-36==12\)
\(3x=48\)
\(x=16\)
\(c,3\left(x-4\right)-\left(8-x\right)=12\)
\(3x-12-8+x=0\)
\(4x-20=0\)
\(4x=20\)
\(x=5\)
Cố nốt nha bn !
cảm ơn, bn nha:)))
mà hình như bạn TOP 3 trả lời câu hỏi pải ko nhỉ???
d, \(-7\left(3x-5\right)+2\left(7x-14\right)=28\)
\(\Leftrightarrow-21x+35+14x-28=28\Leftrightarrow-7x=21\Leftrightarrow x=-3\)
e, \(5\left(3-2x\right)+5\left(x-4\right)=6-4x\)
\(\Leftrightarrow15-6x+5x-20=6-4x\Leftrightarrow-5-x=6-4x\)
\(\Leftrightarrow-11+3x=0\Leftrightarrow x=\frac{11}{3}\)
f, \(-5\left(2-x\right)+4\left(x-3\right)=10x-15\)
\(\Leftrightarrow-10+5x+4x-12=10x-15\Leftrightarrow-22+9x=10x-15\)
\(\Leftrightarrow-7-x=0\Leftrightarrow x=-7\)
Sap xep cac phan so sau theo thu tu tu lon den be
8/9; 4/5; 9/8; 3/4; 10/9; 12/12; 7/8; 1/6; 1/4; 3/2; 1/5; 8/7; 6/5; 5/6; 4/3; 6/7; 2/3; 2/15; 1/2;5/4
Giup mik giai bai toan nay,mik tick cho^_^
a,6/7+5/8:5-3/16(-2)2;b,2/3+1/3*(-2/3+5/6):2/3;c,1/1/2x-1/2=3/4;d,-3/5+(-2/5-99)
b,Tim x
a,(2/11+1/3)*x=(1/7-1/8)*56
*luu y:dau gach / la phan so,con so ma co hai dau nhu the nay:vd:7/1/7 la hon so nhe)
\(a,\frac{6}{7}+\frac{5}{8}:5-\frac{3}{16}\cdot(-2)^2\)
\(=\frac{6}{7}+\frac{5}{8}:\frac{5}{1}-\frac{3}{16}\cdot4\)
\(=\frac{6}{7}+\frac{5}{8}\cdot\frac{1}{5}-\frac{3}{16}\cdot4\)
\(=\frac{6}{7}+\frac{1}{8}-\frac{3\cdot4}{16}\)
\(=\frac{6}{7}+\frac{1}{8}-\frac{3\cdot1}{4}\)
\(=\frac{6}{7}+\frac{1}{8}-\frac{3}{4}=\frac{48+7-42}{56}=\frac{13}{56}\)
\(b,\frac{2}{3}+\frac{1}{3}\cdot\left[\frac{-2}{3}+\frac{5}{6}\right]:\frac{2}{3}\)
\(=\frac{2}{3}+\frac{1}{3}\cdot\left[\frac{-4+5}{6}\right]:\frac{2}{3}\)
\(=\frac{2}{3}+\frac{1}{3}\cdot\frac{1}{6}:\frac{2}{3}=\frac{2}{3}+\frac{1}{3}\cdot\frac{1}{6}\cdot\frac{3}{2}=\frac{2}{3}+\frac{1}{12}=\frac{8}{12}+\frac{1}{12}=\frac{9}{12}=\frac{3}{4}\)
c, Xem lại đề
d, \(\frac{-3}{5}+\left[\frac{-2}{5}-99\right]\)
\(=\frac{-3}{5}+\frac{-497}{5}=\frac{-500}{5}=-100\)
b, Tìm x
\(\left[\frac{2}{11}+\frac{1}{3}\right]\cdot x=\left[\frac{1}{7}-\frac{1}{8}\right]\cdot56\)
\(\Rightarrow\left[\frac{2}{11}+\frac{1}{3}\right]\cdot x=\left[\frac{8}{56}-\frac{7}{56}\right]\cdot56\)
\(\Rightarrow\left[\frac{6}{33}+\frac{11}{33}\right]\cdot x=1\)
\(\Rightarrow\frac{17}{33}\cdot x=1\)
\(\Rightarrow x=1:\frac{17}{33}=1\cdot\frac{33}{17}=\frac{33}{17}\)
1/15 ; 1/9 + 5/9 ; 13/5 ; 5/6 ; 8/5 ; 1/20 ; 7/4 ; 8/5 ; 3/10 ; 1999/9995 ;
5/8 - 3/8 ; 4/60 ; 1/2 + 1/3 ; 7/4 ; 13/ 5 ; 1/5 ; 1/2 - 1/5 ; 5/100 ; 1/4 ; 2/3 ;
Cac cap o chua so, bieu thuc co gia tri bang nhau la?
Cac ban hay giup minh tra loi cau nay nhe !
mẹ cha nhà nó tưởng trả lời được rồi chứ mần câu các bạn giup bạn giải bài này nha ọe
ne co giup thi giup chu dung o do ma noi hon co oe thi di cho khac ma oe chu dung o truoc bai nguoi ta khonh ai muon giup
1/15 ; 1/9 + 5/9 ; 13/5 ; 5/6 ; 8/5 ; 1/20 ; 7/4 ; 8/5 ; 3/10 ; 1999/9995 ;
5/8 - 3/8 ; 4/60 ; 1/2 + 1/3 ; 7/4 ; 13/5 ; 1/5 ; 1/2 - 1/5 ; 5/100 ; 1/4 ; 2/3 ;
Hay xep cac cap o chua so, bieu thuc co gia tri bang nhau la :
tinh tong cac phan so
-du lieu dau vao la file tong.inp gom 1 dong duy nhat chua cac cap so nguyen duong tuong ung voi cac cap tu so, mau so (mau khac 0) cua cac phan so
- du lieu ra la file tong.out 2 so nguyen ghi tren 1 dong tuong ung la tu so va mau so cua phan so ket qua da toi gian
vd:
1 2 2 4 3 8 11 8
1 3 5 6 3 4 2 6 9 4
1 2 2 4 3 8 11 8
Ý là a[1]/a[2] ; a[3]/a[4] ;.....
Bạn ghi lại đề chi tiết hơn nhé.