0.3x = 0.6 + 0.4x, X is equal to?

0.3x = 0.6 + 0.4x, X is equal to?

-6

(1.8-1.8x\1.2)-(1.3-1.3x\2)-(5x-0.4\0.3)=0

(1.8-1.8x\1.2)-(1.3-1.3x\2)-(5x-0.4\0.3)=0(1.8-3x\2)-(1.3-1.3x\2)-(5x-4\3)=01.8-3x\2-1.3+1.3x\2-5x+4\3=0-3x\2+1.3x\2-10x/2+1.8-1.3+4/3=0-11.7x/2+11/6=0117x/20=11/6x=(11/6)*(20/117)x=110/351

1.8-8x/1.2-1.3-3x/0.2=5x-0.4/0.2

（1.8-8x）/1.2-（1.3-3x）/0.2=（5x-0.4）/0.2
1.8-8x-6（1.3-3x）=6（5x-0.4）
1.8-8x-7.8+18x=30x-2.4
20x=-3.6
x=-0.18

（5x-0.4）/0.3+（1.3-3x）/2=（1.8-8x）/1.2

The results show that (50x-4) / 3 + (1.3-3x) / 2 = (9-40x) / 6
To parents 2 (50x-4) + 3 (1.3-3x) / 2 = 9-40x
Remove bracket 100x-8 + 3.9-9x = 9-40x
Transfer 100x-9x + 40x = 9 + 8-3.9
The combined congeners 131x = 13.1
The coefficient is 1 x = 0.1

What are rational numbers made of
There are three

Positive rational number, negative rational number, zero

On the number axis, the distance from the point corresponding to the solution of equation 3x-2m = 1 to the origin is 5 units, then the value of M is

The distance from the solution of the equation to the origin is 5 units, that is, x = 5 or x = - 5
Substituting x = 5 into the equation
2m=14
m=7
X = - 5 is substituted into the equation
2m=-16
m=-8
The value of M is 7 or - 8

The sum of the front and top areas of a cuboid is 209 square centimeters. The length, width and height of the cuboid are prime numbers in centimeters. What are the volume and surface area of the cuboid?

According to the above analysis: length × height + length × width = 209, length × (height + width) = 209, 209 = 19 × 11, either width + height = 11, or width + height = 19, 11 = 2 + 9 = 3 + 8 = 4 + 7 = 5 + 6, no matter how the combination has a composite number, 19 = 2 + 17 = 3 + 16 = 4 + 15 = 5 + 14 = 6 + 13 = 7 + 12 = 8 + 11 = 9 + 10, only the combination of 2 + 17 is prime, the width and height are 2 cm and 17 cm respectively. The volume is: 11 × 17 × 2 = 374 (cubic cm) The area is: (11 × 17 + 11 × 2 + 17 × 2) × 2, = (187 + 22 + 34) × 2, = 243 × 2, = 486 (square centimeter). A: the cuboid has a volume of 374 cubic centimeter and a surface area of 486 square centimeter

The general term formula of sequence {an} an =, f (n) = (1-a1) (1-a2) (1-a3) （1-an）.
(1) Find f (1), f (2), f (3), f (4), and guess the expression of F (n);
(2) Prove your conclusion by numerical induction
An = 1 ÷ (n + 1) square

（1）f1=1/2;f2=4/9;f3=5/12;f4=2/5
Conjecture FN = (n + 2) / (3 (n + 1))
(2) When n = 1, F1 = 1 / 2, the proposition is true
Let FK = (K + 2) / (3 (K + 1)) hold when n = K
Then, when n = K + 1, FK + 1 = FK * (1-ak + 1) = (K + 2) / (3 (K + 1)) * (1-1 / (K + 2) ^ 2)
=((k+1)+2)/(3*((k+1)+1))
According to the formula, the proof is finished
Do more calculus problems, encountered in high school mathematical induction, good miss ah

1, 3, 8, 22, 60126. According to this rule, what is the remainder of the number of 2001 divided by 9

If an = [a (n-2) + a (n-1)] × 2, the following numbers are 186, 498, 684, 1182, 1866, 3048, 4914, 7962, 12876, 20838, 33714, 54552 Among them, from the sixth 126 can be divided by 9, the fifth is 60, can be divided by 6, can not be divided by 9, so the fifth and sixth

Simple calculation of 8 / 15 + (7 / 24 + 8 / 15) + 7 / 24

8/15+(7/24+8/15)+7/24
=8/15+7/24+8/15+7/24
=16/15+14/24
=16/15+7/12
=64/60+35/60
=99/60
=33/20