A number whose square equals 36 () -The negative reciprocal of 3 is () -（-1)^2007+(-1)^2008=

A number whose square equals 36 () -The negative reciprocal of 3 is () -（-1)^2007+(-1)^2008=

six
1/3
two

The square of the sum of x plus five is 25 and factorized

(x+5)²=25
(x+5)²-5²=0
(x+5+5)(x+5-5)=0
x(x+10)=0
x1=0,
x+10=0,x2=-10;

What is the square of 8x minus 16 = 0

What is the square of 8x minus 16 = 0
8x²=16;
x²=2;
x=±√2;
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() = one half × () = one third × () (). Fill in 1-9 in brackets to make the equation true
Nine numbers can't be repeated!

327=654*1/2=981*1/3

6.3 △ x = 7 x △ 4.5 = 1.2 equations

6.3÷x=7
x=6.3÷7
x=0.9
x÷4.5=1.2
x=1.2×4.5
x=5.4

2. Mathematics (tan5 degree - cot5 degree) * sin20 degree / (1 + cos20 degree) = ()?
(Tan 5 degrees - cot 5 degrees) * sin 20 degrees / (1 + cos 20 degrees) = ()?
2. I can't do it~

(tan5 degree - cot5 degree). Sin20 degree / (1 + cos20 degree) reduction: tan5 degree - cot5 degree = (sin ^ 25 cos ^ 25) / sin5cos5 = 2 (sin ^ 25 cos ^ 25) / sin10 reduction: (tan5 degree - cot5 degree). Sin20 degree = 2 (sin ^ 25 cos ^ 25) / sin10 * (2sin10cos10) = 4 (sin ^ 25 -...)

If the solutions of equation 5x-3 = 8x-9 and equation 5Y + A / 6 = 7 / 3 about y are reciprocal, then a=_____ .

5x-3=8x-9
5x-8x=-9+3
-3x=-6
x=2
The reciprocal of 2 is 1 / 2
Y = 1 / 2 into 5Y + A / 6 = 7 / 3
5/2+a/6=7/3
Multiply by 6 on both sides
15+a=14
a=-1
a=-1

Xiaojun ran 4.2km in the morning for 7 days. Xiaojun ran an average of SKM every day

7*s=4.2
S = 0.6 km
Xiaojun runs an average of 0.6 kilometers a day

If the point m (a + 1, 2a-1) is in the fourth quadrant, then the value range of a is______ ．

∵ point m (a + 1, 2a-1) is in the fourth quadrant, ∵ a + 1 > 0, 2a-1 < 0. By solving the inequality, we get - 1 < a < 12, so the answer is - 1 < a < 12

How many hours is four hours and fifty minutes
50 points for all right

1026374361
50 minutes = 50 / 60 hours = 5 / 6 hours
So 4 hours 50 minutes = 4 and 5 / 6 hours