Simple mathematics calculation, please use a simple method to calculate [5 / 2 + (3-1 / 2)] x 3 / 5

[5 / 2 + (3-1 / 2)] x 3 / 5
=[5 / 2 + 5 / 2] x 3 / 5
=3 / 5 5X5
=3

Simple math problem. How to do it?
（﹣105 5/6）×（﹢12）
＝

Original formula = - (100 + 5 + 5 / 6) × 12
=-1200-60-10
=-1270

Help to calculate the simple operation of Mathematics
4.7 times 3 / 4 plus 5.3 divided by 1 and 1 / 3 minus 6.5

Simple calculation:
4.7*(3/4)+[5.3/(4/3)]-6.5
The results are as follows
==4.7*(3/4)+[5.3*(3/4)]-6.5
==[(4.7*+5.3)*(3/4)]-6.5
==[10*(3/4)]-6.5
==(15/2)-6.5
==7.5-6.5
==1

(1) It is known that the system of equations 3x + 5Y = m + 2 is satisfied
2X＋3Y＝M
The sum of X and Y values of M is equal to 2. Find the square of M - 2m + 1
(2) If there is no square term of X in (x's Square - Px + 6) (2x-1), then the value of P is

3X+5Y=M+2 （1）
2X+3Y=M （2）
X+Y=2 （3）
（2）+（3）
3X+4Y=M+2 (4)
(1)-(4),Y=0
X=2
M=2*2+3*0=4
Square of M - 2m + 1 = (4-1) ^ 2 = 9
(the square of x-px + 6) (2x-1)
=2X^3-X^2-2PX^2+PX+12X-6
=2X^3-(1+2P)X^2+PX+12X-6
Without the square term of X,
1+2P=0
P= -0.5

Simple mathematics calculation, please use a simple method to calculate [5 / 2 + (3-1 / 2)] x 3 / 5