What's the quotient of 4 out of 5 minus 3 out of 5 and dividing by 1 out of 5?

What's the quotient of 4 out of 5 minus 3 out of 5 and dividing by 1 out of 5?

one

(1) Two times of x minus the sum of two fifths and 2.5, the difference is 3.5, find X. (2) 12 minus the product of 1.25 and X, and then divide by 0.4, the quotient is 21.5, find X
(3) The sum of 40% of M and 60% of 12 is 9.6

(1) 2 times of x minus the sum of two fifths and 2.5, the difference is 3.5, find X
2X - (2/5 + 2.5) =3.5
2X - 2.9 =3.5
2X = 6.4
X = 3.2
(2) 12 minus the product of 1.25 and X, then divide by 0.4, the quotient is 21.5, find X
( 12 - 1.25X )÷0.4 = 21.5
30 - 0.5X = 21.5
0.5X = 8.5
X = 17
(3) The sum of 40% of M and 60% of 12 is 9.6
40%m +12×60% = 9.6
40%m + 7.2 =9.6
40%X = 2.4
X = 6

The quotient of 16 divided by 4 / 5. Subtracting 4 / 5 of a number, 0.5 more than 1.5, solve the equation

Let this number be X
16÷4/5-4/5x=1.5+0.5
x=18÷0.8=22.5
A: the number is 22.5

The difference between a number and two fifths of it is divided by four, and the result is three fourths

This number = 3 / 4 × 4 ^ (1-2 / 5) = 5

The odd function f (x) defined on R satisfies f (x + 2) = f (x). When 0 ≤ x ≤ 1, f (x) = 2x (1-x), then f (− 52) = ()
A. -12B. -14C. 14D. 12

∵ f (x + 2) = f (x) ∵ the period of function f (x) is t = 2 ∵ f (− 52) & nbsp; = f (− 12) and ∵ f (x) is an odd function on R ∵ f (− 12) & nbsp; = f (12) and ∵ when 0 ≤ x ≤ 1, f (x) = 2x (1-x) ∵ f (12) & nbsp; = 2 × 12 × (1 − 12) & nbsp; = 12 ∵ f (− 52) & nbsp; = f (− 12) = − f (12) & nbsp; = 12, so select a

How to solve 3 (2x-1) cubic = 8 / 9

3 (2x-1) cubic = 8 / 9
3(2x-1)^3=8/9
3(2x-1)^3=(2/3)^3
3(2x-1)=2/3
2x-1=2/9
2x=11/9
x=11/18

The square of 2 / 1 + 2 / the third power of 1 + 2 / the fourth power of 1 + 2 / 1 +2 to the power of 2013 / 1 + 2 to the power of 2014 / 1
The square of 2 / 1 + 2 / the third power of 1 + 2 / the fourth power of 1 + 2 / 1 +2 to the power of 2013 / 1 + 2 to the power of 2014 / 1
/It means fraction

Let t = 1 / 2 + 2 power of 1 / 2 + 3 power of 1 / 2 + 4 power of 1 / 2 + +1 / 2 to the power of 2013 + 1 / 2 to the power of 2014
Then 2T = 1 + 1 / 2 + 2 power of 1 / 2 + 3 power of 1 / 2 + 4 power of 1 / 2 + +1 / 2 to the power of 2012 + 1 / 2 to the power of 2013
The power of T = 2t-t = 1-1 / 2
That is: 1 / 2 + 2 power of 1 / 2 + 3 power of 1 / 2 + 4 power of 1 / 2 + +1 / 2 to the power of 2014 = 1-1 / 2 to the power of 2014

7:4 * 13:6 + 7:3 * 13:6,19:5 * 24-19:5 * 5,27:2 * bracket 15 * 28:27 bracket * 15:2 simple calculation

4 / 7 * 13 / 6 + 3 / 7 * 13 / 6 = (4 / 7 * + 3 / 7) * 6 / 13 = 1 * 13 / 6 = 619 / 13 / 5 * 24-19 / 5 = 5 / 19 * (24-5) = 5 / 19 * 19 = 2 / 527 * bracket 15 * 28 / 27 bracket * 2 / 15 = (2 / 27) * (15 * 27 / 28) * (2 / 15) = (2 / 27) * (27 / 28) * 15 * (...)

2√7-6√7= √80-√20+√5= √18+(√98-√27)= (√24+√0.5)-(√1/8-√6)=
1 / 8 is one eighth of the root

1) 2 times √ 7-6 times √ 7;
(2)√80-√20 + √5;
(3)√18+(√98 -√27);
(4)(√24+√0.5）-（√1/8-√6）

What can be calculated simply is 71 * 14:1 + 27 △ 14 7:8 * 24:7 + 5:1 * 4:5 3.5 * 5:4 + 5.5 * 80% + 0.8%
24 * (5 out of 6-2 out of 3)

71 * 1 / 14 + 27 △ 14
=71 × 1 / 14 + 27 × 1 / 14
=(71 + 27) × 1 / 14
=98 × 1 / 14
=7
8 of 7 * 7 of 24 + 1 of 5 * 5 of 4
=1 / 3 + 1 / 4
=7 out of 12
3.5 * 4 / 5 + 5.5 * 80% + 0.8
=3.5×0.8+5.5×0.8+0.8×1
=0.8×（3.5+5.5+1）
=0.8×10
=8
24 * (5 / 6-2 / 3)
=5 / 24 × 6 - 2 / 24 × 3
=20 -16
=4