(3X-4)-(X-5X)
= 3x-4x+5x
= 7x -4
= 7 x 3/2 -4
= 2 1 /2 -4
= 13 /2
2 points 13
Mathematics in senior two, simplify first and then evaluate: 3x(2x+ 1)-(2x+3)(x-5) where x=-2 3x(2x+ 1)-(2x+3)(x-5).
=6x？ +3x-(2x？ - 10x+3x- 15)
=6x？ +3x-2x？ +7x+ 15
=4x？ + 10x+ 15
X=-2, and the original formula = 4 * 4-2 *10+15 =11.
(Grade 8 Mathematics) Simplify first, then evaluate, 1, x? Three quarters x? -6x+9, where X=3x-6x+9/x-4 = (x-3)/(x+2) (x-2), because x = 3, the result is equal to 0.
x^2-4=(x-2)(x+2)； X 2-6x+9 = (x-3) 2, and the substitution value is 0.
Hope to adopt
Simplify the evaluation of 3 X√9X-X*√X* 1+6X×√4 x, where X=5 is incomprehensible.
Math problem in Grade One: The maximum value of X is 172, and the minimum value is 149. The gap between them is 23. What is the range of x? 149<= X = & lt 172
Simplify the math problem first, and then find x square -4x/x square -8x+ 16, where x = 5 (x 2-4x) divided by (x 2-8x+ 16) is not the case.
Math problems in junior one. If X=-X, then what is x? 0
Because 2X=0,
So X=0.
I'd like to trouble you with the math problem of grade one in junior high school: illustrate the meaning of 2X-5Y with examples. 2X-5Y can be interpreted as income of 2X yuan last year and expenditure of 5Y yuan this year.
Simplify first and then evaluate, 6x2-3xy2-2(3xy2- 1)+6x2, where x=4, y =-2+06x2-3xy2-2 (3xy2-1)+6x2.
=6x？ -3xy？ 6xy？ +2+6x？
=6x？ -3xy？ +6xy？ -2-6 times?
=3xy？ -2
=3×4×(- 1/2)? -2
=3-2
= 1