6 X-1 + 2 3x-1 ≤ 2 3x

6 X-1 + 2 3x-1 ≤ 2 3x

(x-1)/6+(3x-1)/2≤3x/2
x-1+3(3x-1)≤9x
x-1+9x-3≤9x
x≤4

0.5 (x + 4) - 0.4 (x + 4) = 3.2

0.5(x+4)—0.4(x+4)=3.2
0.1(x+4)=3.2
x+4=3.2÷0.1
x+4=32
x=32-4
x=28

We know that the geometric meaning of the formula | x-3 | is the distance between the point representing the number x on the number axis and the point representing the number 3, then the minimum value of the formula | x-4 | + | X-2 | is

2
no problem

How much is 8 out of 7 minus 5 out of 18 plus 1 out of 7 plus 13 out of 18?

8 / 7-5 / 18 + 1 / 7 + 13 / 18 = 109 / 63 = 109 / 63

Given that the polynomial (m-1) x4-xn + 2x-5 is a cubic trinomial, we can find the value of (M + 1) n
Note: X4 is the fourth power of X, xn is the nth power of X (M + 1) and N is the nth power of (M + 1)

Because: (m-1) x4-xn + 2x-5 is a cubic trinomial
So: M-1 = 0, n = 3
The solution is m = 1, n = 3
So: (M + 1) ^ n = (1 + 1) ^ 3 = 8

How many milliliters of this alcohol is needed to prepare 200 grams of 75% alcohol solution
Chemical purity of ethanol: cp.500ml, density: 0.81g/cm3, mass fraction: 95%

We need x ml of this alcohol
200*75%=0.81x*95%
x=194.9ml

How to divide 5 / 1 and 7 / 23

The least common multiple of denominator is 23
Multiply the previous denominator by 23. In order to keep the size of the fraction unchanged, multiply the numerator by 23 to make 115 / 23
Divide, add and subtract

Two fifths multiplied by eight Sevens divided by eight Sevens multiplied by two fifths?

2/5×8/7÷8/7×2/5
=2/5×2/5
=4/25

Simple calculation method of 29 / 20 - (19 / 20-1 / 3)

=29/20-19/20+1/3 =1/2+1/3 =5/6

Using seven nines to make two formulas, the result is 55

9 × 9-9-9-9 + 9 / 9 = 55
2、 9 × 9 - (9 + 9 + 9) + 9 / 9 = 55