minh xin loi nha tai cai phan tim nay minh kem lam len minh ko giup dc cho ban roi xin loi Huyen Anh Kute

neu la phan khac thi minh da giai cho cau dc roi xin loi cau rat nhieu Huyen Anh Kute

Trộn lẫn V ml dung dịch NaOH 0,01M với V ml dung dịch HCl 0,03M thu được 2V ml dung dịch Y. Dung dịch Y có pH là:

A. 1.

B. 2.

C. 3.

D. 4. 

A=(-3x\(^5\)y\(^3\))\(^4\)

B=(2x\(^2\)z\(^4\))\(^5\)

Day moi la de dung de cua cau thieu roi day

A+B=81x\(^{20}\)y\(^{12}\)+32x\(^{10}\)z\(^{20}\)

vi 81x\(^{20}\)y\(^{12}\)>0;32x\(^{10}\)z\(^{20}\)>0

nen A+B=0 <=>x\(^{20}\)y\(^{12}\)=0 =>x=0 ;y va z bat ki

x\(^{10}\)z\(^{20}\)=0 =>y=z=0 ;x bat ki

B-A=(x\(^2\)+5y-6x+3xy\(^2\))-(4x-x\(^2\)+x\(^2\)y-1+y)

= x\(^2\)+5y-6x+3xy\(^2\)-4x+x\(^2\)-x\(^2\)y+1-y

=(x\(^2\)+x\(^2\))+(5y-y)+(-6x-4x)+3xy\(^2\)-x\(^2\)y+1

=2x\(^2\)+4y-10x+3xy\(^2\)-x\(^2\)y+1