813 / 410
Tinh
A=-7/813+496×(-7/813)+(-7/813)×316
\(A=-\frac{7}{813}+496.-\frac{7}{813}+-\frac{7}{813}.316\)
\(A=-\frac{7}{813}.\left(1+496+316\right)\)
\(A=-\frac{7}{813}.813\)
\(A=-7\)
Tính nhanh
C = -7/813 + 496 x (-7/813) + (-7/813) x 316
C=-7/813+496 x (-7/813)+(-7/813) x 316
=-7/813 x (1+496+316)
=-7/813 x 813
=-7
\(C=\frac{-7}{813}+496.\frac{-7}{813}+\frac{-7}{813}.316\)
\(C=\frac{-7}{813}.1+496.\frac{-7}{813}+\frac{-7}{813}.316\)
\(C=\frac{-7}{813}.\left(1+496+316\right)\)
\(C=\frac{-7}{813}.813\)
\(C=\frac{-5691}{813}=-7\)
\(C=\frac{-7}{813}+496\cdot\frac{-7}{813}+\frac{-7}{813}\cdot316\)
\(C=\frac{-7}{813}\cdot1+496\cdot\frac{-7}{813}+\frac{-7}{813}\cdot316\)
\(C=\frac{-7}{813}\cdot\left[1+496+316\right]\)
\(C=\frac{-7}{813}\cdot813=-7\)
\(\frac{-7}{813}+496\cdot\frac{-7}{813}+\frac{-7}{813}\cdot316\)
ai nhanh nhất mình tik!thanks
= \(\frac{-7}{813}.\left(1+496+316\right)=\frac{-7}{813}.813=-7\)
Rút gọn biểu thức: a) x + 51 + (-56) + 24; b) (-65) - ( x + 27) + 26 c) 813 - ( 813 - x) + 213 d) 125 - (125 - x) + 22
Tính d ) 8 13 : 4
27<813:3x<243
27 < 813 : 3x <243
⇒ 33 < (34)3 : 3x <35
⇒ 33 < 312 : 3x <35
⇒ 33 < 312-x <35
⇒ 3 <12-x < 5
⇒ -9 < x < 7
813-5x=28
\(813-5x=28\)
\(5x=813-28\)
\(5x=785\)
\(x=785\div5\)
\(x=157\)
813 - 5x = 28
5x = 813 - 28 = 785
x = 785 : 5 = 157
813 - 5x = 28
813 - 28 = 5x
5x = 785
x = 785 : 5
x = 157
Vậy x= 157
Tính: c ) 9 13 : 3 26 - 8 13
37 x 275 x 813
\(=3^7\times\left(3^3\right)^5\times\left(2^3\right)^{13}=3^7\times3^{15}\times2^{39}=3^{22}\times2^{39}\)
37.275.813
=37.(33)5.813
=37.315.(23)13
=322.239
Thực hiện phép tính 4 5 + 1 2 . 3 13 − 8 13
8 10 + 5 10 . 3 + ( − 8 ) 13 = 15 10 . − 5 10 = 3 2 . − 1 2 = − 3 4