By adding two zeros at the end of 0.5, his size will remain unchanged, and his meaning will change to five tenths, right

No, its meaning should be changed from five tenths to five thousandths
0.5: one tenth
0.50: 1%
0.500: one thousandth
0.5000: one in ten thousand
…… (and so on)

1. The triangle of () is called obtuse triangle
2. The triangle of () is called a right triangle
3. The triangle of () is called obtuse triangle

1. A triangle with an obtuse angle is called an obtuse triangle
2. A triangle with a right angle is called a right triangle
3. The triangle of () is called obtuse triangle
The third one is the same as the first one. You should ask about the acute triangle
A triangle is an acute triangle

The first x = 1-4 / x-3, the second x-4 / X-1 = 1-2 / 3-x, the third 3 / 1 + 3x + 1 = X-2 / X-1, the fourth 4 / x-3-3 / x-4 = 2 / 1
Fifth: 4 / x + 3-1 = 2 / x-3-2 sixth: 0.5 / 0.4x-0.1 = 0.3 / 0.1 + 0.2x - 0.6 above / sign is the fractional line, seek the master answer!

(1) X = 1-4 / x-3 multiply both sides by X ∵ x square = x-4-3x shift x square + 2x + 4 = 0 ∵ discriminant = 4-16 = - 12 ∵ no real number root (2) x-4 / X-1 = 1-2 / 3-x multiply both sides by 3x 3x square - 12-3x = 3x-2x-3x square 6x square - 4x-12 = 03x Square - 2x-6 = 0 ∵ discriminant = 4 + 72 = 76 ∵ 0 ∵ there are unequal real numbers

For rational numbers a and B, define x operation as follows: a × B = (a + b) - (a-b), find the value of (- 3) × 4

=（-3+4）-（-3-4）=8

12345 five numbers, row into a five digit, do not repeat, from large to small, a total of 120 five digits, ask the 95th number is?

If the first is 5, then there are 4 × 3 × 2 × 1 = 24 and 5
So the first four, three, two are also 24
There are 24 × 4 = 96
Among them, the first is the smallest of 2, that is, the 96th is 21345
So number 95 is 21354

Let a be an M * n matrix and B be an n * m matrix. It is proved that if R (a) = n, then R (AB) = R (b)

If R (a) = n
Combining R (a) = n
In addition, we also know that R (b)

If a two digit number is divided by a one digit number, the quotient is still two digits, the remainder is 8, and the sum of divisor, divisor and quotient is______ ．

According to the meaning of the question, the minimum divisor is 8 + 1 = 9, and because the divisor is a one digit number, the divisor must be 9, because it is a two digit number divided by a one digit number, and the quotient is still two digits. If the quotient is 10, then: 10 × 9 + 8 = 98, which is in line with the meaning of the question; if the quotient is 11, then: 11 × 9 + 8 = 107, which is not in line with the meaning of the question; so the divisor is 98, the quotient is 10, the divisor is 9, and the remainder is 8, 98 + 10 + 9 + 8 = 125 The sum of divisor, divisor and quotient is 125

1111 = 0 2222 = 0 3333 = 0 4444 = 4 1234 = 1 5678 = 3 6666 = how much

Four circles

Two thirds of the boys in class 61 are equal to one fourth of the girls. How many boys are compared with the girls

Solution 1:
According to the known conditions, 2 / 3 of the number of boys is equal to 1 / 4 of the number of girls
1/4÷2/3=3/8
A: the ratio of boys to girls is 3 / 8
Solution 2
Setting: the number of boys is x, and the number of girls is y
Two thirds of the known number of boys is equal to one fourth of the number of girls
Then the equation is 2 / 3x = 1 / 4Y
According to the calculation, X / y = 3 / 8
A: the ratio of boys to girls is 3 / 8

The significant numbers of approximate number 0.02030 are______

Significant number: for an approximate number, from the first number on the left that is not zero to the exact number of digits, all the numbers are called the significant figure of the number
So the significant number of 0.02030 is 2030

By adding two zeros at the end of 0.5, his size will remain unchanged, and his meaning will change to five tenths, right