Find the value of 1.sin20 ° cos70 ° + sin10 ° sin50 ° 2.cos 5 / 8 π cos 8 / 8 π

Find the value of 1.sin20 ° cos70 ° + sin10 ° sin50 ° 2.cos 5 / 8 π cos 8 / 8 π

1.sin20°cos70°＋sin10°sin50° =sin20°sin20°＋(cos40°-cos60°)/2 =(1-cos40°)/2＋(cos40°-cos60°)/2 =(1-cos60°)/2=(1-1/2)/2=1/4.2.cos(5π/8+π/8)=cos5π/8cosπ/8-sin5π/8sinπ/8=-√2/2cos(5π/8...
3 corners + circle = 30 3 corners + 2 circles = 48 find out the number of each corner and circle
X = 12... Y = 18 /. Mining
How many parts of a meter is 6 decimeters?
Six tenths of a meter
2 triangles = 3 squares, 3 squares = 4 circles, 1 triangle + 1 square + 2 circles = 400 circles, what are the triangles and squares
△=3×□/2
○=3×□/4
So 3 × □ / 2 + □ + 2 × 3 × □ / 4 = 400
(3/2+1+3/2)×□=400
4×□=400
therefore
□=400÷4=100
△=3×□/2=150
○=3×□/4=75
79 decimeters = a few tenths of a meter
79 decimeters = 79 / 10 meters
No way
79 out of 10
Seventy nine meters out of ten
Nine tenths of a meter to the right of 7 is equal to 79 tenths of a meter.
Seventy nine tenths of a meter
Seventy nine tenths of a meter
790 meters per cent
79 decimeter is 7.9 decimeter, and the advance rate of decimeter and meter is 10. Therefore, using 10 as denominator and dividing 79 by 10 is 79 meters out of 10, which can also be converted into 7 and 9 meters out of 10
seventy-nine-tenths
10 cm is equal to 1 decimeter. 79 decimeter is equal to 7.90 cm.
Angle 1 = 40 ° and angle 5 = 30 ° calculate the degree of angle 2, angle 3 and angle 4
None, and each corner of a triangle with an angle of 180 ° is greater than 0 ° as for sin, brown, sin equals zero, because sin0 = 0, cos90 = 0, tan0 = 0
What's 24 decimeters?
12 / 5m
If triangle + circle + square = 48, circle + circle + square + square = 30, then triangle equals 35 ()
(×) triangle equals 33
Let the triangle be X
∵ triangle + circle + square = 48
Circle + circle + square + square = 30
Ψ triangle + circle + square + circle + circle + square + square = 48 + 30
That is, x + 3 (circle + square) = 78
3 (circle + square) = 78-x
Circle + square = (78-x) divided by 3
Substituting, we get:
X + (78-x) divided by 3 = 48
The solution is: x = 33
This is a false proposition
Wrong. From the second formula, 2 (circle + square) = 30, so circle + square = 15
Bring in the first formula, triangle + 15 = 48, so triangle = 33
888888 * 888888 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 is equal to several parts
888888*888888=790121876544
1+2+3+4+5+6+7+8+7+6+5+4+3+2+1=64
790121876544÷64=12345654321
Square × triangle × square triangle = triangle, what is triangle equal to, what is square equal to
emergency
Product: triangle must be a multiple of 111
111=3*37
So the solution should be 3 * 7 * 37 = 777
Triangle equals 7, square equals 3
Because square x triangle x square triangle = triangle
So square 2, triangle 2 = triangle 3
Square 2 = triangle
So just square 2 = triangle
For example, square = 2, triangle = 4
I'm not sure