10^3 + 2*5^3 +5^3 phan 55
cau1:1 pha n5.(-3 phan 5 - 10)+ 5x =x -2 phan 3
cau2:-3 phan 2(5 - 1 phan 6) +4 (x-1 phan 2)=1
10^3+2×5^3+5^3/55
10^ 3+2×5^3+5^3/55
Tim phan so bang nhau
4 /5 ; 6 / 7 ; 3 / 10 ; 21 / 70 ; 30 / 35 ; 44 / 55 ; 100 / 25 ; 33 / 110 54 / 63
4/5=44/55
54/63=6/7
3/10=21/70=33/110
điền dấu sao bởi số thích hợp
7.*phần *.*=-35 phan 55
chung to phan so sau toi gian
15.n+1 phan 30.n+1
n+1phan 2.n +3
2.n+3 phan 3.n +5
Bài 2:
a: Gọi d=UCLN(30n+1;15n+1)
\(\Leftrightarrow30n+2-30n-1⋮d\)
=>d=1
=>Phân số tối giản
b: Gọi d=UCLN(2n+3;n+1)
\(\Leftrightarrow2n+3-2n-2⋮d\)
=>d=1
=>Phân số tối giản
c: Gọi \(d=ƯCLN\left(2n+3;3n+5\right)\)
\(\Leftrightarrow6n+9-6n-10⋮d\)
=>d=1
=>ƯCLN(2n+3;3n+5)=1
=>Phân số tối giản
500-{5[409-(2^3.3-21)^2]+10^3}:15
{[(3^2+1).10-(8:2+6)]:2}+55-10(10:5)^3
\(\dfrac{10^3+2\cdot5^3+5^3}{55}\)
\(=\dfrac{1000+250+125}{55}=25\)
\(\dfrac{1000+2.125+125}{55}\)=\(\dfrac{1000+250+125}{55}\)=\(\dfrac{1375}{55}\)=25
22(x+32)-5=55
155-10(x+1)=55
5.22+(x+3)=52
53-5(4+x)=15
a/ 22(x + 32) - 5 = 55 b/ 155 - 10(x+1) = 55
4(x + 32) = 60 10(x + 1) = 100
x + 32 = 60 : 4 x + 1 = 10
x + 32 = 15 x = 10 - 1
x = 15 - 32 x = 9
x = - 17
c/ 5. 22 + (x+3) = 52 53 - 5 (4 + x) = 15
20 + (x+3) = 25 125 - 5(4 +x) = 15
x+ 3 = 5 5(4 + x) = 110
x = 5-3 4 + x= 110 : 2
x = 2 4 + x = 55
x = 51
ủng hộ mk nha !!!! ^_^
viet cac so do duoi dang so thap phan
a. 1 phan 4 gio
2 phan 3 phut
2 phan 5 gio
b. 3 phan 4 kg
7 phan 10 m
3 phan 5 km
a.\(\frac{1}{4}giờ=0,25giờ\)
\(\frac{2}{3}phút=0,666phút\)
\(\frac{2}{5}giờ=0,4giờ\)
b.\(\frac{3}{4}kg=0,75kg\)
\(\frac{7}{10}m=0,7m\)
\(\frac{3}{5}km=0,6km\)