The X of nine minus the (x + 1) of four times three, plus 27 equals 0. Calculate the value of X To write a process, it's about exponents and exponentials

The X of nine minus the (x + 1) of four times three, plus 27 equals 0. Calculate the value of X To write a process, it's about exponents and exponentials

9^x - 4* 3^(x+1) +27 = 0;
(3^x)^2 - 12* 3^x + 27 = 0;
It is regarded as a quadratic equation with one variable of 3 ^ X;
(3^x - 3)(3^x - 9)=0;
x_ 1 = 1; x_ 2 = 2;

8. Calculation: (+ 1) + (- 2) + (+ 3) + (- 4) + ＋（＋99）＋（－100）

Combination of the two
(1-2)+（3-4）+.+（99-100）
=-1*50
=-50

How to calculate the total score of Chinese * 0.4 + mathematics * 0.6 in the worksheet

Simple set out a space, which is the specific results
The formula of this space = math score * 0.4 + English score * 0.4 + political score * 0.2, then his comprehensive score will come out