Tinh gia tri cua bieu thuc:
2,34 : (2,34 - 1,09) x 35 + 21,086
Tinh gia tri cua bieu thuc:
2,34 : (2,34 - 1,09) x 35 + 21,086
2,34 : (2,34 - 1,09) x 35 + 21,086
= 2,34 : 1,25 x 35 + 21,086
= 1,872 x 35 + 21,086
= 65,52 + 21,086 86,606
Chúc bạn học tốt !!!!!!!!!!!!!!!!!!!!!!
2,34 : ( 2,34 - 1,09 ) × 35 + 21,086
= 2,34 : 1,25 × 35 + 21,086
= 1,872 × 35 + 21,086
= 65,52 + 21,085
= 86,606
Cho mk 1 tk nhé
Tinh gia tri bieu thuc
2,34 : (2,34-1,09)×35+21,086
Giup minh voi!
=2,34/1,25*35+21,086
=1,872*35+21,086
=65,52+21,086
=86,606
đúng đấy , k cho mình nha
Tính giá trị của biểu thức :
2,34 : (2,34 - 1,09 ) x 35 +21,086
2,34 : ( 2,34 - 1,09 ) . 35 + 21,086
= 2,34 : 1,25 . 35 + 21,086
= 1,872 . 35 + 21,086
= 65,52 + 21,086
= 86,606
2,34 : ( 2,34 - 1,09 ) . 35 + 21,086
= 2,34 : 1,25 . 35 + 21,086
= 1,872 . 35 + 21,086
= 65,52 + 21,086
= 86,606
= 2,34 : 1,25 * 35 + 21,086
= 1,872 * 35 + 21,086
= 65,52 + 21, 086
= 86,606
cho x+y =1 . tinh gia tri cua bieu thuc A=x^3+y^3+3xy
chox-y=1. tinh gia tri cua bieu thuc B=x^3-y^3-3xy
cho x+y=1 . tinh gia tri cua bieu thuc C=x^3+y^3+3xy(x^2+y^2)+6x^2*y^2(x+y)
Câu 1: Ta có: A = \(x^3+y^3+3xy=x^3+y^3+3xy\times1=x^3+y^3+3xy\left(x+y\right)\)
\(=\left(x+y\right)^3=1^3=1\)
Câu 2: Ta có: \(B=x^3-y^3-3xy=\left(x-y\right)\left(x^2+xy+y^2\right)-3xy\)
\(=x^2+xy+y^2-3xy=x^2-2xy+y^2=\left(x-y\right)^2=1^2=1\)
Câu 3: Ta có: \(C=x^3+y^3+3xy\left(x^2+y^2\right)-6x^2.y^2\left(x+y\right)\)
\(=x^3+y^3+3xy\left(x^2+2xy+y^2-2xy\right)+6x^2y^2\)
\(=x^3+y^3+3xy\left(x+y\right)^2-3xy.2xy+6x^2y^2\)
\(=x^3+y^3+3xy.1-6x^2y^2+6x^2y^3\)
\(=x^3+y^3+3xy\left(x+y\right)=\left(x+y\right)^3=1^3=1\)
bai 1 tinh gia tri cua bieu thuc 78 x m + 22 x m voi m =135
bai 2 tinh gia tri cua bieu thuc 78 x m + 42 x m -20 x m voi m =1035
bai 3 cho bieu thuc B = 119 x n - n x 9 bieu thuc B co gia tri bang 8470 khi n =............
tinh gia tri cua bieu thuc
1995-321*3-6020:35
1995-321*3-6020:35
=1995-963-172
=1032-712
=320
1995-321x3-6020:35=1995-963-172=1032-172=320
1995 - 321 x 3 - 6020 : 35
=1995 - 963 - 172
=1032 - 172
=320
cho bieu thuc A=[x+2/x^2-x+x-2/x^2+x].x^2-1/x^2+2
a) tim dieu kien cua x de gia tri cua bieu thuc A duoc xac dinh
b) tinh gia tri cua bieu thuc A voi x = -200
a) \(A=\left[\dfrac{x+2}{x^2-x}+\dfrac{x-2}{x^2+x}\right].\dfrac{x^2-1}{x^2-x}\)
\(A=\left[\dfrac{x+2}{x\left(x-1\right)}+\dfrac{x-2}{x\left(x+1\right)}\right].\dfrac{x^2-1}{x^2+2}\)
\(A=\left[\dfrac{\left(x+2\right)\left(x+1\right)+\left(x-2\right)\left(x-1\right)}{x\left(x-1\right)\left(x+1\right)}\right].\dfrac{x^2-1}{x^2+2}\)
\(A=\left[\dfrac{x^2+2x+x+2+x^2-2x-x+2}{x\left(x-1\right)\left(x+1\right)}\right].\dfrac{x^2-1}{x^2+2}\)
\(A=\dfrac{2x^2+4}{x\left(x^2-1\right)}.\dfrac{x^2-1}{x^2+2}\)
\(A=\dfrac{2\left(x^2+2\right)\left(x^2-1\right)}{x\left(x^2-1\right)\left(x^2+2\right)}=\dfrac{2}{x}\)
b) Thay \(x=-200\) vào biểu thức \(A=\dfrac{2}{x}\) ta được :
\(A=\dfrac{2}{x}=\dfrac{2}{-200}=\dfrac{-2}{200}=\dfrac{-1}{100}\)
cho a R b =a*b/ a+b . Tinh gia tri bieu thuc cua : 13R7 - 12r4 . TINH gia tri cua bieu thuc tren ( 30 giay )
\(\frac{31}{20}\)đáp số đúng 1000000000000000000000000000000000000000000000000000% đó nha
h and kb nhé
a ) 18,06 x 4 : 42 + 58 : 25
b ) 2,34 : ( 2,34 - 1,09 ) x 3,5 - 2,006
a) 18,06.4:42+58:25=1,72+2,32=4,04
b) 2,34:(2,34-1,09).3,5-2,006=(2,34:1,25.3,5)-2,006=6,552-2,006=4,546