Simple calculation score of mathematics in sixth grade: 3 / 18 △ 7 + 1 / 7 × 6 / 13 mathematics 3 / 18 △ 7 + 1 / 7 × 6 / 13

Simple calculation score of mathematics in sixth grade: 3 / 18 △ 7 + 1 / 7 × 6 / 13 mathematics 3 / 18 △ 7 + 1 / 7 × 6 / 13

3/18÷7+1/7x6/13
=3/18x1/7+1/7x6/13
=1/7x(3/18+6/13)
=1/7x(39/234+108/234)
=1/7x147
(I want to make my own score here)
=21

It is known that in △ ABC, ab = 5, BC = 12, AC = 13. Find the high BD of △ ABC
In BD, you can't upload a right triangle,

AB*AB+BC*BC=AC*AC
The area AB * BC / 2 = AC * BD / 2
BD=13/(5*12)

Given a + B = 3, ab = - 12, find the value of the following formula. (1) a ^ 2 + B ^ 2 = (a + b) ^ 2-2ab = 3 ^ 2-2 * (- 12) = 30

=3^2-2*(-12)
=30
（2）a^2-ab+b^2
=a^2+2ab+b^2-3ab
=(a+b)^2-3ab
=3^2-3*(-12)
=45
（3）(a-b)^2
=a^2-2ab+b^2
=a^2+2ab+b^2-4ab
=(a+b)^2-4ab
=3^2-4*(-12)
=57

How to combine eight eights to add up to 10000

8+8+8+88+8888=10000

3x plus 60 / 100x equals 432 / 100. What's x?
It's a formula

3x plus 60 / 100x equals 432 / 100. What's x?
(3x+60)/100x=432/100
3x+60=432x
x=20/143

How much is 10000 plus 1
Is it 10001

10000 plus one is 10001. The big one plus a small one is insignificant

How much is 0.75 minus 3 of 16?

75 minus 3 of 16 parts
=3 / 4-3 / 16
=12 / 16-3 / 16
=9 / 16

×1+2!×2+3!×3+…… What is the remainder of 90! × 90 + 91! × 91 divided by 2002

First, n * n! = (n + 1) * n! - n! = (n + 1)! - n!
So, 1! * 1 + 2! * 2 +... + 91! * 91=
(2!-1!) + (3!-2!) + ...+(92!-91!) = 91!-1
Then, 2002 = 2 * 7 * 11 * 13
So the remainder of 91! Divided by 2002 is 0, and after subtracting one, the remainder is 2001
If there is anything unclear, ask me again!

When Xiao Hong is doing a division problem, she takes the divisor 30 as 3. The result shows that the quotient is 93 and the remainder is 2. What is the correct quotient and remainder?

The divisor: 93 times 3 + 1 equals 280. The correct quotient and remainder is: 280 divided by 30 equals 9... 10

When Xiao Hong is doing her homework, she takes the divisor 30 as 3. The result shows that the quotient is 93 and the remainder is 1. So what is the correct quotient and remainder?

3*93+1=280
280/30=9…… ten
The quotient is 9 and the remainder is 10