20.2-0.2x = 0.2 (x is unknown)

20.2-0.2x = 0.2 (x is unknown)

The solution is as follows
20.2-0.2=0.2x
20=0.2x
x=100

90.5×99+90.5．

90.5×99+90.5，=90.5×99+90.5×1，=90.5×（99+1），=90.5×100，=9050．

Solve the equations: X / 2 = Y / 3 (1) 3x + 4y-9 = 0 (2) velocity!

X=1 Y=3/2

80% of boys is equal to 3 / 4 of girls, and boys are ()% of girls
It took Li Ming three hours to climb from the foot of the mountain to the top of the mountain and two hours to return from the original road. Li Ming traveled an average of ()% of the road every hour
Divide 8 catties of meat equally among 5 people, and each person gets ()% of the meat, ()% of 1 catty of meat, and ()% of 2 catties of meat

80% of the male population is equal to 3 / 4 of the female population, and the male population is 93.75% of the female population
It took Li Ming three hours to climb from the foot of the mountain to the top of the mountain, and two hours to return from the original road. Li Ming traveled an average of (40)% of the road every hour
Divide 8 catties of meat to 5 people on average, each person gets (20)% of the meat, each person gets (2.5)% of 1 catty of meat, and each person gets (5)% of 2 catties of meat

Is the root of 2 rational?

It seems to be 1.4 It's an infinite acyclic number, so it's irrational

There are three numbers of a, B and C, of which a accounts for one third, B is one fifth of a and C, and the sum of a, B and C is 180. What are the three numbers of a, B and C
There should be formulas and detailed figures. I don't want words to show it

B is one fifth of a and C, which means B is one sixth
So Party A and Party B are 1 / 6 + 1 / 3 = 1 / 2
So the total is 360, a 120, B 60, C 180

Given that - 3a is a negative number, then A.A is greater than 0, B.A is less than 0, C.A is less than or equal to zero

-3a0
a>0
Choose a

The sum of a, B and C is 98, the sum of a and C is 106, and the sum of B and C is 120. What are the three numbers of a, B and C?
There's also math, numbers, formulas, right now

The difference between B and a is 14;
The sum of the difference between B and a and the sum of B and a is twice that of B, that is 112, so B equals 56;
98 minus 56, the value of a is 42; 120 minus 56, the value of C is 64

The equation cos2x + SiNx = q + 1 has a real solution when the real number q is in what range

cos2x+sinx=1-2(sinx)^2+sinx
=-2(sinx-1/4)^2+9/8
-1

9 / 5 / 4 / 3 × 2 = () 120 / 3 / 20 / 3 = ()

24 / 5 and 6