Giúp nình câu b với ạ
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18: \(\left(x^2-4\right)\left(x^2+4\right)=x^4-16\)
19: \(\left(x+y\right)^2+\left(x-y\right)^2=2x^2+2y^2\)
20: \(\left(2x+3\right)^2-\left(x+1\right)^2\)
\(=\left(2x+3-x-1\right)\left(2x+3+x+1\right)\)
\(=\left(x+2\right)\left(3x+4\right)\)
giải luôn nhé
A= -2x+4y-6z+3x+6y-6-3z
=x+10y-9z-6
B=4x-6y+8z-4x+12y-4z-5z+5x
=5x+6y-z
chúc bạn hk giỏi!!!
A = \(-2\left(x-2y+3z\right)-3\left(-x-2y+2\right)-3z\)
A = \(-2x+4y-6z+3x+6y-6-3z\)
A = \(\left(-2x+3x\right)+\left(4y+6y\right)-\left(6z-3z\right)-6\)
A = \(-x+10y-2z-6\)
B = \(2\left(2x-3y+4z\right)-4\left(x-3y+z\right)-5\left(z-x\right)\)
B = \(4x-6y+8z-4x+12y-4z-5z+5x\)
B = \(\left(4x-4x+5x\right)-\left(6y+12y\right)+\left(8z-4z-5z\right)\)
B = \(5x-18y-1z\)
Sắp xếp những từ sau để viết thành câu hoàn chỉnh.
1. badminton/school/classmates/after/play/my/often.
--> My classmates often play badminton after school.
2. school/group/theater/play/they/their/are/a/with/rearsing.
-->They are rearsing a play with their school theater group.
1)My classmates often play badminton after school
2)The are rearsing a play with their school theater group