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Solution: 3x-x+1=5, 2x=4, x=2
Solution: 10+2x-1=7x-14 -5x=-20 x=4
Solution: 1-2x-2=2 3-3x=2 3-1+2=5 3
Solution: 9x 4-x 6=1 (27x-2x) 12=1 25x=12 x=12 25
Solution: 3x 2-2x 3-x=-1-1+2 (9x-4x) 6=0 x=0
9x/2-3x/4=-5-6+3+1/2
18x-3x)/4=-15/2 -21x/4=-15/2 x=5/7
Solution 3 (20x-12)-2=4 20x-12=6 3 20x=14 x=14 20=7 10
8.Solution: y+2=y2+5-y, 6-4-1, 2 y-y, 2+y, 6=5-4-1, 2-2 (6y-3y+y), 6=-3 2 4y, 6=-3, 2 y=-9, 4
9.Solution: 20-3y+5-6y=1-6y-4 -3y-6y+6y=1-4-20-5 -3y=-28 y=28 3
10.Solution: 14x-7-12x+3=12-8-1 2x=3+7-3 x=7 2
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(sinx-3)(sinx+1)=0 i.e. sinx=3, sinx=-1, since sinx is at [-1,1], so sinx=-1
x=2k -1 2 (k is an integer).
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(sinx-3)(sinx+1)=0;
sinx=3 or sinx=-1;
sinx=3 is impossible;
sinx=-1;
x=-π/2+2kπ(k∈z)
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Let sinx=m, then the equation is m-square, -2m-3=0 m, and the domain of m is (-1,1), and the solution gives m=-1 or m=3 (rounded), so m=-1, sinx=-1, x=3/2 +k
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The second y=x-2 brings in the first one to get x 4-[x-2] =1 to get [3x-10] [x-2] = 0
Get x=2, y=0, or x=10 3, y=4 3
Question 3 Add 2x = 6, x = 3, y = 1
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1000 parts x = 2 parts of x.
1000 parts x = parts of x.
1250/x - 1250/x =
250 parts of x =
100/x = 1
x=100
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Multiply 100 on both sides of the equation at the same time
30*20+30x-20*30-20x=36*300600+x=300*36 to solve x
1) Left = x (2x + 5) = 0, x = 0 or 2x + 5 = 0, x = -5 22) Left - Right = y 2 + 2y + 1 = (y + 1) 2 = 0, y = -13) right = (2 + x) (2-x), x = 2 is a solution, or both sides are reduced, -x = 2 + x, x = -1 >>>More
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x=24 ❷ >>>More
A: 21x|+|y|=5
23.When x is 2, the minimum value is 0 >>>More
1/1 + 1/2-1 = 1/2
1/3 + 1/4 - 1/2 = 1/12 >>>More