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)
giúp em với đang cần gấp ạ

answer: the center is the median and/or mean of the data. the spread is the range of the data. and, the shape describes the type of graph. the four ways to describe shape are whether it is symmetric, how many peaks it has, if it is skewed to the left or right, and whether it is uniform. good luck

step-by-step explanation:

(1 km=1000m, 1m=100 cm)