a) \(\left(-\frac{1}{7}\right)^0-2\frac{4}{9}x\left(-\frac{2}{3}\right)^2\); b) \(\frac{2^7x9^2}{3^3x2^5}\).
1. Tính hợp lí
a, 6/7 . 5/11 + 5/7 . 2/11 - 5/7 . 14/ 11
b, 1/3 . 4/5 + 1/3 . 6/5 - 1/3
( Hỗn số )
c, 11/3/13 - (2/4/7 + 5/3/13)
d, 2/7 . 5/1/4 - 2/7 . 3/1/4
e, 75 . (-4/24 + 7/1/15 - 5/7/15)
Giải hộ mình với ạ!
a) \(1\dfrac{4}{23}+\dfrac{5}{21}\dfrac{4}{23}+0,5+\dfrac{16}{21}\)
b)\(\dfrac{3}{7}.19\dfrac{1}{3}-\dfrac{3}{7}.33\dfrac{1}{3}\)
c)\(15\dfrac{1}{4}:\left(-\dfrac{5}{7}\right)-25\dfrac{1}{4}:\left(-\dfrac{5}{7}\right)\)
d)\(\left(-\dfrac{2}{3}+\dfrac{3}{7}\right):\dfrac{4}{5}+\left(\dfrac{-1}{3}+\dfrac{4}{7}\right):\dfrac{4}{5}\)
a,2/3.x+5/7=3/10 b,3/4.x-1/2=3/7
Tính
1. 6/5 - 1/4 + 4/5 - 3/4
2. 7/9 - 5/12 + 2/9 - 7/12
3. -4/15 + 5/13 - 11/15 + 8/13
4. 9/15 - 7/13 +6/15 - 6/13
5. 12/5 - 3/7 + 3/5 - 4/7
6. 6/5 - 1/4 + 4/5 - 3/4 + 1/2
7. 13/7 - 8/6 + 8/7 - 4/6 - 1/3
TÌM THƯƠNG A/B
A= 9/1 + 8/2 + 7/3 + 6/4 + 5/5 + 4/6 + 3/7 + 2/8 + 1/9
B=1/2 + 1/3 + 1/4 + 1/5 + 1/6 + 1/7 + 1/8 + 1/9 + 1/10
HELP ME
3.a: -3/2-2x+3/4=-4
b: (-2/3.x-3/5).(3/-2-10/3)=2/5
c: x/2-(3x/5-13/5)=-(7/5+7/10x)
d: (3/2-5/11-3/13).(2x-2)=(-3/4+5/22+3/26)
e: 2/3x-3/12=4/5-(7/x-2)
a)\(\dfrac{\left(x+\dfrac{3}{4}\right)\cdot\dfrac{7}{2}-\dfrac{1}{6}}{-\left(\dfrac{4}{5}+\dfrac{1}{3}\right)\cdot\dfrac{1}{2}+1}=2\dfrac{33}{52}\)
b)\(\dfrac{\left(5-\dfrac{2}{7}\right)\cdot\dfrac{7}{9}:\dfrac{3}{5}}{\left(3x-\dfrac{5}{6}\right):\dfrac{1}{7}}=5\dfrac{5}{21}\)
Bài 7: Tìm X
rút gọn biểu thức :
A= 937.1-4.5)-(-4.5+37.1)-100
B= 2^15 *9^4/6^6*8^3
C= tử số : (13và 1/4 -2vaf 5/27-10va 5/6)*230 và 1/25+46 và 3/4 +46 và 3/4
mẫu số : 1 và 3/7+10/3)/ (12 và 1/3 -14 và 2/7 )
D= (0.8 *7+0.8^2)*(1.25*7-4/5*1.25)+31.64