rut gon roi tinh 17/51 x 45/30
24/15 x 56/72 x10 14
32/48 x 35/21 x 63/14 x 9/ 30
3/6 x 8/12 x 15/20 x 24/30 x 35/42 x 48/56 x 63/72 x 80/90
Tính nhanh
rút gọn thành
1/2 x 2/3 x 3/4 x 4/5 x 5/6 x 6/7 x 7/8 x 8/9
1x2x3x4x5x6x7x8
__________________
2x3x4x5x6x7x8x9
gạch các số giống nhau ở tử và mẫu và bằng 1/9
a, 8-3/5
b, 24/15 nhân 56/72 nhân 10/14
c, 32/48 nhân 35/21 nhân 63/14 nhân 9/30
d, 7 - 72/48 nhân 56/60 -3
các bạn ơi giúp mình với
a)\(8-\frac{3}{5}=\frac{40}{5}-\frac{3}{5}=\frac{37}{5}\)
b)\(\frac{24}{15}\times\frac{56}{72}\times\frac{10}{14}=\frac{13440}{15120}=\frac{8}{9}\)
c)\(\frac{32}{48}\times\frac{35}{21}\times\frac{63}{14}\times\frac{9}{30}=\frac{2}{3}\times\frac{5}{3}\times\frac{9}{2}\times\frac{3}{10}=\frac{270}{180}=\frac{3}{2}\)
d)\(7-\frac{72}{48}\times\frac{56}{60}-3=7-\frac{3}{2}\times\frac{14}{15}-3\)
\(=7-\frac{7}{5}-3\)
\(=\frac{35}{5}-\frac{7}{5}-\frac{15}{5}\)
\(=\frac{13}{5}\)
#H
(Sai thì sửa)
rut gon roi tinh:
28/35*15/72*1 va 7/49.
miru
Rút gọn rồi tính:
\(\frac{28}{35}.\frac{15}{72}.1\frac{7}{49}\)
\(=\frac{4}{5}.\frac{5}{24}.\frac{56}{49}\)
\(=\frac{4.5.8}{5.24.7}=\frac{4}{21}\)
\(\frac{28}{35}.\frac{15}{72}.1\frac{7}{49}\)
\(=\frac{4}{5}.\frac{5}{24}.\frac{7}{49}\)
\(=\frac{4}{21}\)
k mk nha, cảm ơn những người đã k
rút gọn rồi tính:
33/15 x 35/21 x 63/14 x 9/30
33/15 x 35/21 x 63/14 x 9/30
= 11/5 x 5/3 x 9/2 x 3/10
= 99/20
= \(\frac{33}{15}\)x \(\frac{5}{3}\)x \(\frac{9}{2}\)x \(\frac{3}{10}\)
= \(\frac{11}{3}\)x \(\frac{9}{2}\)x \(\frac{3}{10}\)
= \(\frac{33}{2}\)x \(\frac{3}{10}\)
= \(\frac{99}{20}\)
Rut gon phan so:
2^23 x 45^25 x 13^22 x 35^16/9^26 x 65^22 x 28^17 x 25^9
lam on giup mk dc ko ?
\(\frac{2^{23}\cdot45^{25}\cdot13^{22}\cdot35^{16}}{9^{26}\cdot65^{22}\cdot28^{17}\cdot25^9}=\frac{2^{23}\cdot5^{25}\cdot3^{50}\cdot13^{22}\cdot5^{16}\cdot7^{16}}{3^{52}\cdot5^{22}\cdot13^{22}\cdot7^{17}\cdot2^{54}\cdot5^{18}}=\frac{2^{23}\cdot3^{50}\cdot5^{31}\cdot7^{16}\cdot13^{22}}{2^{54}\cdot3^{52}\cdot5^{22}\cdot7^{17}\cdot13^{22}}=\frac{5^9}{2^{31}\cdot3^2\cdot7}\)
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50+51+52+53+54+56+57+58+59+60+61+62+63+64+65+66+67+68+69+70=?
Bài 1: Tìm x , biết:
1) x - 2 = -6 12) 3 . | x - 1 | - 5 = 7
2) -5 . x - ( -3 ) = 13 13) -12 . ( x - 5 ) + 7 . ( 3 - x ) = 5
3) 15 - ( x - 7 ) = -21 14) ( x - 2 ) . ( x + 4 ) = 0
4) 3 .x + 17 = 2 15) ( x - 2 ) . ( x + 15 ) = 0
5) 45 - ( x - 9 ) = -35 16) ( 7 - x ) . ( x + 19 ) = 0
6) ( -5 ) + x = 15 17) -5 < x < 1
7) 2 . x - ( -17 ) = 15 18) | x | < 3
8) | x - 2 | = 3 19) ( x - 3 ) . ( x - 5 ) < 0
9) | x - 3 | - 7 = 13 20) 2 . x2 - 3 = 29
10) 72 - 3 . | x + 1 | = 9 21) -6 . x - ( -7) = 25
11) 17 - ( 43 - | x | ) = 45 22) 46 =- ( x - 11 ) = -48
1) x - 2 = -6
x = -6 + 2
x = -4
2) -5 . x - ( -3 ) =13
-5 . x = 13 + ( -3 )
-5 . x = 10
x = 10 : ( -5 )
x = -2
a) 7 x 5 = ..... 7 x 6 = ..... 7 x 8 = ..... 7 x 4 = .....
35 : 7 = ..... 42 : 7 = ..... 56 : 7 = ..... 28 : 7 = .....
b) 42 : 7 = ..... 35 : 7 = ..... 63 : 7 = ..... 16 : 2 = .....
14 : 7 = ..... 49 : 7 = ..... 7 : 7 = ..... 48 : 6 = .....
28 : 7 = ..... 70 : = ..... 21 : 7 = ..... 56 : 7 = .....
a) 7 x 5 = 35 7 x 6 = 42 7 x 8 = 56 7 x 4 = 28
35 : 7 = 5 42 : 7 = 6 56 : 7 = 8 28 : 7 = 4
b) 42 : 7 = 6 35 : 7 = 5 63 : 7 = 9 16 : 2 = 8
14 : 7 = 2 49 : 7 = 7 7 : 7 = 1 48 : 6 = 8
28 : 7 = 4 70 : =10 21 : 7 = 3 56 : 7 = 8