Tính :
\(B=\frac{3^6.45^4-15^3:5^9}{27^4.25^3+45^6}\)
Bài 1: Thực hiện phép tính:
a, \(\left(\dfrac{7}{20}+\dfrac{11}{15}-\dfrac{15}{12}\right):\left(\dfrac{11}{20}-\dfrac{26}{45}\right)\)
b, \(\dfrac{5-\dfrac{5}{3}+\dfrac{5}{9}-\dfrac{5}{27}}{8-\dfrac{8}{3}+\dfrac{8}{9}-\dfrac{8}{27}}:\dfrac{15-\dfrac{15}{11}+\dfrac{15}{121}}{16-\dfrac{16}{11}+\dfrac{16}{121}}\)
c, \(\dfrac{\dfrac{1}{9}-\dfrac{5}{6}-4}{\dfrac{7}{12}-\dfrac{1}{36}-10}\)
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
tính hợp lí ( nếu có thể )
\(B=\left(\frac{2}{3}-\frac{1}{4}+\frac{5}{11}\right):\left(\frac{5}{12}+1-\frac{7}{11}\right)\)
\(C=\left(-\frac{14}{33}\right).2\frac{4}{9}+\frac{48}{25}:\frac{27}{25}\)
\(D=\left(3-2\frac{1}{3}+\frac{1}{4}\right):\left(4-5\frac{1}{6}+2\frac{1}{4}\right)\)
\(G=\left(7\frac{1}{9}-2\frac{14}{15}\right):\left(2\frac{2}{3}-6\frac{2}{3}\right)-\frac{32}{45}\)
\(H=-\frac{1}{7}.\left(9\frac{1}{2}-8,75\right):\frac{2}{7}+0,625:1\frac{2}{3}\)
Tính giá trị biểu thức
a) [545-(45+4.25)]:50-2000:250+215:213
b) [504-(25.8+70)]:9-15+90
c)5.{26-[3.(5+2.5)+15]:15}
d)16:{400:[200-(37+46.3)]}
e) 12:{390:[500-(125+35.7)]}
g) 12000-91500.2+1800.3+1800.2:3
j){[126(36-31)2.2]-9}.1001
g)[(14+3).2-5].9.1-325
f)[(46-32)2-(54-42)2 ] 36-1872
giúp mình với! mình đang cần giấp
3.Tính hợp lí
a, 21.35-3.25.7
b, 77-11.(30+7)
c, 85.(35-27)-35.(85-27)
d, 47.(45-15)-47.(45+15)
Tính giá trị biểu thức
\(\dfrac{\dfrac{2}{3}.\dfrac{7}{15}-\dfrac{2}{3}.\dfrac{5}{27}}{\dfrac{-9}{9}.\dfrac{7}{15}+\dfrac{4}{9}.\dfrac{5}{27}}\)
Tìm x
6-2(x+4)=-4
6 chia hết x
2x-15:5=-7
231-(x-6)=1339:13
(x-12):6=3 - x^2-1=3
28-x^3=1
(x+2)^3=27
81-(x-5)^2=56
x^2=9
14 chia hết x +3
Rút gọn:
1) \(\dfrac{45^2.3^8.10^5}{5^5.3^7.18^5}\)
2)\(\dfrac{4^5.9^4+2.6^9}{2^{10}.3^8+6^8.20}\)
3) \(\dfrac{15.3^{11}+4.27^4}{9^7}\)
4) \(\dfrac{4^7.2^8}{3.2^{15}.16^2-5.2^2\left(2^{10}\right)^2}\)
5) \(\dfrac{2^{19}.27^3+15.4^9.9^4}{6^9.2^{10}+12^{10}}\)
6) \(\dfrac{12^6.5^2-2^{10}.3^5.5^2}{12^6.10-2^{12}.3^8}\)
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