a: =16692-57=16635

b: =81000+123=81123

c: =63963+2488/35=2241193/35

a: =16692-57=16635

b: =81000+123=81123

c: =63963+2488/35=2241193/35

Tính giá trị biểu thức.                           428 x 39 - 4674 chia 82

b) Thay x=-28

\(\left(-2\right)+17+\left(-28\right)=-13\)

c) Thay x=-4

\(\left(-4\right)+25+\left(-47\right)=-26\)

d) Thay x=8

\(25+8+\left(-13\right)=20\)

a) 78 060 : (10 – 7) + 300 045

= 78 060 : 3 + 300 045

= 26 020 + 300 045

= 326 065

b) 26 000 + 9 015 × 6

= 26 000 + 54 090

= 80 090

a) Với a = 3,05 thì ta có:

\(a\times2,46\) \(=3,05\times2,46=7,503\)

b) Với \(a=\dfrac{15}{8}\) thì ta có:

\(\left(\dfrac{5}{6}+\dfrac{7}{12}\right):a\) \(=\left(\dfrac{5}{6}+\dfrac{7}{12}\right):\dfrac{15}{8}\) \(=\left(\dfrac{10}{12}+\dfrac{7}{12}\right)\times\dfrac{8}{15}\) \(=\dfrac{17}{12}\times\dfrac{8}{15}\) \(=\dfrac{34}{45}\)

a) Thay a=3,05 vào 2,46a, ta được:

\(2.46\cdot3.05=7.503\)

b) Thay \(a=\dfrac{15}{8}\) vào biểu thức \(\left(\dfrac{5}{6}+\dfrac{7}{12}\right):a\), ta được:

\(\left(\dfrac{5}{6}+\dfrac{7}{12}\right):\dfrac{15}{8}\)

\(=\dfrac{17}{12}\cdot\dfrac{8}{15}=\dfrac{34}{45}\)

a: \(x\left(x-y\right)+y\left(x+y\right)\)

\(=x^2-xy+xy+y^2\)

\(=x^2+y^2\)

=100

b: \(x\left(x^2-y\right)-x^2\left(x+y\right)+y\left(x^2-x\right)\)

\(=x^3-xy-x^3-x^2y+x^2y-xy\)

\(=-2xy\)

Viết sai đề 😡

Sửa đề: A=7/12-9/20+11/30-13/42+15/56

A=1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7+1/7+1/8

=1/3+1/8=11/24

a) Có x = 2020 => x + 1 = 2021. Thay 2021 = x + 1 vào A

\(A=x^6-\left(x+1\right)^5+\left(x+1\right)x^4-\left(x+1\right)x^3+\left(x+1\right)x^2-\left(x+1\right)x+x+1\)

\(A=x^6-x^6-x^5+x^5+x^4-x^4-x^3+x^3+x^2-x^2-x+x+1\)

\(A=1\)

b) Có x = -19 => x - 1 = -20 => - ( x - 1 ) = 20. Thay 20 = - ( x - 1) vào B

\(B=x^{10}-\left(x-1\right)x^9-\left(x-1\right)x^8-\left(x-1\right)x^7-...-\left(x-1\right)x^2-\left(x-1\right)x-x+1\)

\(B=x^{10}-x^{10}+x^9-x^9+...+x^2-x^2+x-x+1\)

\(B=1\)

Chúc bạn học tốt!!!