Thực hiện phép tính
{245.8-125:(3.12-11)}:5+3.(234-2.19)
{245.8-125:(3.12-11)}:5+3.(234-2.19)
b3 : Tinh Tong
A ) 5+6+7+8+....+99+100 B) 3+5+7+9+......+97+99
C) 4+6+8+10+......+98+100 D) 20+25+30 + ...,,,,,,,+995+1000
Thực hiện phép tính: a) (-19).(-3); b) (-23).(-11); c) (-125).(-6); d) (-200).(-5);
Thực hiện chiến phép tính
E=1/9-1/7-1/11/4/9-4/7-4/11+3/5-3/25-3/125-3/625/4/5-4/25-4/125-4/625
1. Thực hiện phép tính ( tính nhanh )
a, -6/35 : -54/49
b,-5/7.2/11+5/7.9/11+1 1/5
c,( 1/3 + 3/4 - 13/12 ) : ( 12/13 +123/234 +1234/2345 )
Thực hiện phép tính:
a) 16.4
b) (-125).(-6)
c) (-23).(-11)
d) (-200).(-5)
a) 16.4 = 64
b) (-125).(-6) = 750
c) (-23).(-11) = 253
d) (-200).(-5) = 1000
Thực hiện phép tính
a) 16.4
b) (-125).(-6)
c) (-23).(-11)
d) (-200).(-5)
a) 16.4 = 64
b) (-125).(-6) = 750
c) (-23).(-11) = 253
d) (-200).(-5) = 1000
Thực hiện phép tính
a)\(\dfrac{5^{16}.27^{7}}{125^{5}.9^{11}}\)
b)\((-0,2)^{2}.5-\dfrac{2^{13}.27^{3}}{4^{6}.9^{5}}\)
c)\(\dfrac{5^{6}+2^{2}.25^{3}+2^{3}.125^{2}}{26.5^{6}}\)
\(a,\dfrac{5^{16}\cdot27^7}{125^5\cdot9^{11}}=\dfrac{5^{16}\cdot\left(3^3\right)^7}{\left(5^3\right)^5\cdot\left(3^2\right)^{11}}\)
\(=\dfrac{5^{16}\cdot3^{21}}{5^{15}\cdot3^{22}}=\dfrac{5}{3}\)
\(b,\left(-0,2\right)^2\cdot5-\dfrac{2^{13}\cdot27^3}{4^6\cdot9^5}\)
\(=0,04\cdot5-\dfrac{2^{13}\cdot\left(3^3\right)^3}{\left(2^2\right)^6\cdot\left(3^2\right)^5}\)
\(=0,2-\dfrac{2^{13}\cdot3^9}{2^{12}\cdot3^{10}}\)
\(=0,2-\dfrac{2}{3}\)
\(=-\dfrac{7}{15}\)
\(c,\dfrac{5^6+2^2\cdot25^3+2^3\cdot125^2}{26\cdot5^6}\)
\(=\dfrac{5^6+2^2\cdot\left(5^2\right)^3+2^3\cdot\left(5^3\right)^2}{5^6\cdot26}\)
\(=\dfrac{5^6+4\cdot5^6+8\cdot5^6}{5^6\cdot26}\)
\(=\dfrac{5^6\left(1+4+8\right)}{5^6\cdot26}\)
\(=\dfrac{13}{26}\)
\(=\dfrac{1}{2}\)
#\(Toru\)
\(a,\dfrac{5^{16}.27^7}{125^5.9^{11}}=\dfrac{\left(5^2\right)^8.9^7.3^7}{25^5.5^5.9^{11}}\\ =\dfrac{25^8.9^7.\left(3^2\right)^3.3}{25^5.\left(5^2\right)^2.5.9^{11}}=\dfrac{25^8.9^7.9^3.3}{25^5.25^2.5.9^{11}}\\ =\dfrac{25^8.9^{10}.3}{25^7.5.9^{11}}=\dfrac{25^7.9^{10}.25.3}{25^7.9^{10}.5.9}\\ =\dfrac{25.3}{5.9}=\dfrac{5.5.3}{5.3.3}=\dfrac{5}{3}\)
1. Thực hiện phép tính, tính hợp lý nếu có thể:
a) 4 . 12 + 4 . 88. b) 72 - 6 . [ 2 . ( 5 + 3 ) : 8 ].
2. Tìm x:
a) 11 + x = 26. b) ( 4x - 15 )3 = 125
1.a) 4.(12+88) = 4.100=400
b)72- 6 .[2.8:8 ]=72-6.[16:8]=72-6 .2= 49-12=37 ( tui ko chắc lắm )
2.a) x=26-11=15
b) (4x-15)3=53
4x-15=5
4x= 5+15
4x=20
vậy x = 20
Bài 2:
a: Ta có: x+11=26
nên x=15
b: Ta có: \(\left(4x-15\right)^3=125\)
\(\Leftrightarrow4x-15=5\)
hay x=5
Thực hiện phép tính bằng các hợp lý:
11/125 - 17/18 - 5/7 + 4/9 + 17/14
11/125 - 17/18 - 5/7 + 4/9 + 17/14
=11/125 - (17/18 - 4/9) - (5/7 -17/14)
=11/125 - (17/18 - 8/18) - (10/14 - 17/14)
=11/125 - 9/18 + 7/14
=11/125 - 1/2 + 1/2
=11/125 (= 0,88)