10:2x3+6-2=?
Giải phương trình: 4 x - 2 x 3 + 6 - x 2 + x 2 = 10 - x .
A. x = 21 13
B. x = - 21 13
C. x = 7 13
D. x = 15 13
A)A=25.(231+900)+75,231-900.24
B)B=6^2:2x3+4^2x3^4x79-2^3x5
b: \(B=18\cdot3+16\cdot81\cdot79-8\cdot5\)
=102398
Thực hiện phép tính:
A=5x(2^2x3^2)^9x(^*2)^6-2x(2^2x3)^14x3^4 / 5x2^28x3^18-7x2^29x3^18
de gi ma dai, ghi lon xon, chang hieu gi ca??
2^2x3-(1^10+8):3^2
2 mũ 2 x 3 - ( 1 mũ 10 + 8 ) : 3 mũ 2
= 2 mũ 6 - 1 : 9
= (64 - 1) :9
= 63 : 9
= 7
Bn nhớ k cho mk nha !
hk tốt Châu Giang
1 Tính
64+6 mũ 2x19
2 mũ 2x3-(1 mũ 10+8)3 mũ 2
7 mũ 2-36:3 mũ 2
Mk đang cần gấp
64+62x19 22x3-(110+8)32 72-36:32
=64+36x19 =4x3-(1+8)9 =49-36:9
=100x19 =12-(1+8)9 =49-4
=1900 =12-9.9 =45
=-6
Hok tốt!
1. Tính
a) 5/7 x 4 : 5/9
b) 8 x 2/3 : 1/2
c) 6 : 3/5 - 7/6 x 6/7
21/5 x 10/11 + 57/11
2. Tìm x
a) 35/9 : x = 35/6
b) (1/1x2 + 1/2x3 + 1/3x4 +1/4x5 +1/5x6) x 10- x = 0
1> a) \(\frac{5}{7}x4:\frac{5}{9}=\frac{5}{7}:\frac{5}{9}x4=\frac{5}{7}x\frac{9}{5}x4=\frac{9}{7}x4=\frac{9x4}{7}=\frac{36}{7}\)
\(b,8x\frac{2}{3}:\frac{1}{2}=8x\frac{2}{3}x\frac{2}{1}=8x2x\frac{2}{3}=16x\frac{2}{3}=\frac{32}{3}\)
\(c,6:\frac{3}{5}-\frac{7}{6}x\frac{6}{7}=6x\frac{5}{3}-1=10-1=9\)
\(\frac{21}{5}x\frac{10}{11}+\frac{57}{11}=\frac{42}{11}+\frac{57}{11}=\frac{99}{11}=9\)
2) a) \(\frac{35}{9}:x=\frac{35}{6}\)
\(x=\frac{35}{9}:\frac{35}{6}\)
\(x=\frac{35}{9}x\frac{6}{35}\)
\(x=\frac{2}{3}\)
b) \(\left(\frac{1}{1x2}+\frac{1}{2x3}+\frac{1}{3x4}+\frac{1}{4x5}+\frac{1}{5x6}\right)x10-X=0\)
\(\left(\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+.....+\frac{1}{5}-\frac{1}{6}\right)x10-X=0\)
\(\left(\frac{1}{1}-\frac{1}{6}\right)x10-X=10\)
\(\frac{5}{6}x10-X=0\)
\(X=\frac{5}{6}x10=\frac{25}{3}\)
Đúng nha !!!!
1/a/\(\frac{5}{7}\cdot4:\frac{5}{9}=\frac{20}{7}:\frac{5}{9}=\frac{20}{7}\cdot\frac{9}{5}=\frac{36}{7}\)
b/\(8\cdot\frac{2}{3}:\frac{1}{2}=\frac{16}{3}:\frac{1}{2}=\frac{16}{3}\cdot\frac{2}{1}=\frac{32}{3}\)
c/\(6:\frac{3}{5}-\frac{7}{6}\cdot\frac{6}{7}=6\cdot\frac{5}{3}-1=10-1=9\)
2/a/\(\frac{35}{9}:x=\frac{35}{6}\)
\(x=\frac{35}{9}:\frac{35}{6}=\frac{35}{9}\cdot\frac{6}{35}\)
\(x=\frac{2}{3}\)
b/\(\left(\frac{1}{1\cdot2}+\frac{1}{2\cdot3}+\frac{1}{3\cdot4}+\frac{1}{4\cdot5}+\frac{1}{5\cdot6}\right)\cdot10-x=0\)
\(\left(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}\right)\cdot10-x=0\)
\(\left(\frac{30}{60}+\frac{10}{60}+\frac{5}{60}+\frac{2}{30}\right)\cdot10-x=0\)
\(\frac{47}{60}\cdot10-x=0\)
\(\frac{47}{6}-x=0\)
\(x=\frac{47}{6}-0\)
\(x=\frac{47}{6}\)
(x - 2) : 2x3=6
(x - 2) : 2 = 6:3
(x - 2) : 2 = 2
x - 2 = 2 x 2
x - 2 = 4
x = 4 + 2
x = 6
(x-2):6=6
(x-2) =6x6
x-2 =36
x =36+2
x =38
ok nha bn
(x - 2) : 2 = 6:3
(x - 2) : 2 = 2
x - 2 = 2 x 2
x - 2 = 4
x = 4 + 2
x = 6
cái trước mình tính nhầm =))))
CMR:
a,12+22+32+......+n2= [n ( n + 1 ) (2n + 1)] :6
b, 1x2+ 2x3 + 3x4 +.......+n ( n+10 ) = n (n + 1) (n + 2)
so sánh A= 1/2x3/4x5/6.......99/100 và B=1/10
dấu x này là dấu nhân nhé!