(12+27+34)*(27+34+56)-(12+27+34+56)*(27+34) Simple calculation

(12+27+34)*(27+34+56)-(12+27+34+56)*(27+34) Simple calculation

Put forward 27 = + 34 ~!

How about 10 / 24: 10 / 64: 10 / 56?
How to turn it into integer ratio?

24=8×3
64=8×8
56=8×7
So the least common multiple is 8 × 3 × 8 × 7 = 1344
So multiply by 1344 and divide by 10
10/24 :10/64:10/56=56:21:24

24 hours minus 3 minutes 56 seconds how to calculate?

24 hours minus 3 minutes 56 seconds
=23:00 + 60 minutes - 3:56 seconds
=23:00 + 56 minutes + 1 minute - 56 seconds
=23:00 + 56 minutes + 4 seconds
=23:56:4

Given f (2x + 1) = x & # 178; + 2x + 3, then f (1) =?

Let 2x + 1 = 1 get x = 0
therefore
Substituting x = 0 into function
f﹙2*0+1﹚=0²+2*0+3=3
That is, f = 3

Given f (x + 1) = x & # 178; + 2x + 3, find the analytic expression of F (x)

f(x+1)=x²+2x+3
Let x + 1 = t
Then x = T-1
Then f (x + 1) = x & # 178; + 2x + 3 = (t-1) ^ 2 + 2 (t-1) + 3 = T ^ 2-2t + 1 + 2t-2 + 3 = T ^ 2 + 2
Then f (x) = x ^ 2 + 2

If f (2x + 1) = x & # 178; + 2x + 1, then f (0) = 0 is equal to X or 2x + 1

0 is equal to 2x + 1
x=-1/2
So f (0) = 1 / 4

Given that x is not equal to 1, calculate the square of [1 + x] [1 minus x] = 1 minus X

This is the square difference formula

How to calculate that x square plus x equals 240

Why is x square - 15x + 50 ≤ 0 equal to: (X-5) (X-10) ≤ 0? How is this calculated? Why is it written like this? Please be more detailed, thank you

(X-5) (X-10) can be obtained by factoring X & # 178; - 15x + 50

The square of 50 x plus 100 x minus 22 equals zero

50xx+100x-22=0
（5x+11）（10x-2）=0
x=-11/5 or x=1/5