Toán 8 - hàng đẳng thức : thực hiện phép tính:
a. (x+1)(x^2-x+1)-(x-1)(x^2+x+1)
b. (x^2+2x+1)^2+(2x+1)^2-2(x^2+2x+1)(2 x+1)
c. -3x(x^2)^2+(x+3)(x-1)(x+1)-(2x-3)^2
d. (2x-3)^3+(4-2x)(16+8x+4x^2)+(4x+3)( 9x+1)
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Cot(90° − x) = 1 the value of x that satisfies this equation is °. a. 60 b. 135 c. 225 d. 315

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The number of 8th graders who responded to a poll of 6th grade and 8 th graders was one fourtg of the number of 6th graders whi responded if a total of 100 students responddd to the poll how many of the students responded were 6 th graders