计算.1.3y²分之2x²×6x分之5y÷21x的平方分之10y.2.9-x²分之x²-6x+9÷x²+3x分之2x-6 3.2ab分之4a²+4ab+b²×6a+3b分之2a²b.4已知X-3Y=0,求x²-2xy+y²分之2x+y ×(x-y)的值
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/18 21:51:13
![计算.1.3y²分之2x²×6x分之5y÷21x的平方分之10y.2.9-x²分之x²-6x+9÷x²+3x分之2x-6 3.2ab分之4a²+4ab+b²×6a+3b分之2a²b.4已知X-3Y=0,求x²-2xy+y²分之2x+y ×(x-y)的值](/uploads/image/z/444647-47-7.jpg?t=%E8%AE%A1%E7%AE%97.1.3y%26%23178%3B%E5%88%86%E4%B9%8B2x%26%23178%3B%C3%976x%E5%88%86%E4%B9%8B5y%C3%B721x%E7%9A%84%E5%B9%B3%E6%96%B9%E5%88%86%E4%B9%8B10y.%26%238203%3B2.9-x%26%23178%3B%E5%88%86%E4%B9%8Bx%26%23178%3B-6x%2B9%C3%B7x%26%23178%3B%2B3x%E5%88%86%E4%B9%8B2x-6+3.2ab%E5%88%86%E4%B9%8B4a%26%23178%3B%2B4ab%2Bb%26%23178%3B%C3%976a%2B3b%E5%88%86%E4%B9%8B2a%26%23178%3Bb.4%E5%B7%B2%E7%9F%A5X-3Y%3D0%2C%E6%B1%82x%26%23178%3B-2xy%2By%26%23178%3B%E5%88%86%E4%B9%8B2x%2By+%C3%97%EF%BC%88x-y%29%E7%9A%84%E5%80%BC)
计算.1.3y²分之2x²×6x分之5y÷21x的平方分之10y.2.9-x²分之x²-6x+9÷x²+3x分之2x-6 3.2ab分之4a²+4ab+b²×6a+3b分之2a²b.4已知X-3Y=0,求x²-2xy+y²分之2x+y ×(x-y)的值
计算.1.3y²分之2x²×6x分之5y÷21x的平方分之10y.
2.9-x²分之x²-6x+9÷x²+3x分之2x-6 3.2ab分之4a²+4ab+b²×6a+3b分之2a²b.4已知X-3Y=0,求x²-2xy+y²分之2x+y ×(x-y)的值
计算.1.3y²分之2x²×6x分之5y÷21x的平方分之10y.2.9-x²分之x²-6x+9÷x²+3x分之2x-6 3.2ab分之4a²+4ab+b²×6a+3b分之2a²b.4已知X-3Y=0,求x²-2xy+y²分之2x+y ×(x-y)的值
1.3y²分之2x²×6x分之5y÷21x的平方分之10y
=(3y² × 6x ×10y)分之(2x² × 5y × 21x²)
=6y²分之7x³
2.9-x²分之x²-6x+9÷x²+3x分之2x-6
=(3+x)(3-x)分之(x-3)² × 2(x-3)分之x(x+3)
=-x/2
3.2ab分之4a²+4ab+b²×6a+3b分之2a²b.
=2ab分之(2a+b)² × 3(2a+b)分之2a²b
=a(2a+b)/3
=(2a²+ab)/3
4已知X-3Y=0,求x²-2xy+y²分之2x+y ×(x-y)
X-3Y=0
则,x=3y
x²-2xy+y²分之2x+y ×(x-y)
=(x-y)² 分之 (2x+y)(x-y)
=(x-y)分之 (2x+y)
=(3y-y)分之 (6y+y)
=2y分之7y
=2分之7