Ta có:
(3-1/4 + 2/3) - (5 + 1/3 - 6/5) - (6 - 7/4+3/2)
= 3 - 1/4 + 2/3 - 5 - 1/3 + 6/5 - 6 + 7/4 - 3/2
= (3 - 5 - 6 ) - (1/4 - 7/4 + 3/2) + ( 2/3 - 1/3) + 6/5
= - 8 - 0 + 1/3 +6/5
= -8 + 1/3 + 6/5
= -23/3 + 6/5
= -97/15
Nhớ tick cho mk với nha!!!!
tìm x
d)3/2 -4(1/4-x)=2/3-7x
e)3(1/2-x)+1/3=7/6-x
f)4(1/2-x)-5(x-3/10)=7/4
g)-3/2(4/5-2/3)+x=7/6-x
thực hiện phép tính
E = (12/35-6/ 7+18/14):6/-7-(-2/5)-1
G=(-5/7-7/9+9/11-11/13)(12/4-3/4)/ (10/21+14/27-6/11+22/39):(6/3-2/3)
a,5(x-2)+3x (x-2)=0
b,2/3+5/2:x=2/4
c,2x(x-1/7)=0
d,11/12-(2/5+x)=2/3
e,3/4+1/4:x=2/5
g,2/3x+5/7=3/10
\(\dfrac{4}{5}-\left(\dfrac{-2}{7}\right)-\dfrac{7}{10}\)
\(\left(6-\dfrac{2}{3}+\dfrac{1}{2}\right)-\left(5+\dfrac{5}{3}-\dfrac{3}{2}\right)-\left(3-\dfrac{7}{3}+\dfrac{5}{2}\right)\)
bài 1: tính nhanh
a= ( 6-2/3+1/2)-(5+5/3-3/2)-( 3-7/3+5/2)
a= ( 6-2/3+1/2)-(5+5/3-3/2)-( 3-7/3+5/2)
4) (3/7)^2.(-7)^4
5) (-11)^12.(4/11)^6
6) (-6)^8.(5/6)^7
tính :
S=1+2-3-4+5+6-7-8+9...+98-99-100+101+102
Bài 1:Viết các số sáu dưới dang số hữu tỉ:
-4 1/6 5 2/3 -6 1/6
Bài 2:Viết các số sáu dưới dang số hữu tỉ:
9 4/5 -10 1/2 1 1/10