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计算:(2xy2)3-4xy(2x2y5+xy)
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计算12xy+3x2-5xy-23xy+2x2
若x是方程4﹣4x﹣3=29﹣x的解y是方程62y﹣5+20=41﹣2y的解求2﹣3xy+x2﹣[2
下列计算正确的是
(﹣2a
2
b
3
)÷(﹣2ab)=a
2
b
2
(3x
2
y﹣6xy)÷6xy=0.5x
(21x
5
y
2
﹣9x
4
y
3
)÷3x
3
y
2
=7x
2
﹣3xy
(3x
2
y+xy)÷xy=3x
若x+22+|y-1|=0求4xy-2x2+5xy-y2+2x2+3xy的值.
若x+22+|y-1|=0求4xy-2x2+5xy-y2+2x2+3xy的值.
一个多项式加上x2y-3xy2得2x2y-xy2则这个多项式是
3x
2
y-4xy
2
;
x
2
y-4xy
2
;
x
2
y+2xy
2
;
-x
2
y-2xy
2
化简与计算1已知多项式A.=2x2﹣xyB.=x2+xy﹣623x2y﹣|2xy2﹣2xy﹣3x2y
5xy2﹣{2x2y﹣[3xy2﹣xy2﹣2x2y]÷﹣xy}.
先化简再求值.4xy﹣[x2+5xy﹣y2﹣2x2+3xy﹣y2]其中x=﹣1y=2.
下列各运算中计算正确的是
4xy+xy=5xy
x+2x=2x²
5xy-3xy=2
x+y=xy
将4x3y-8x2y2+4xy3分解因式结果为
xy(2x-2y)
2
2xy(x-y)
2
4xy(x
2
-2xy+y
2
)
4xy(x-y)
2
已知xy2=2求-xyx2y5-xy3-y
已知x﹣32+|y+2|=0求4xy﹣2x2+5xy﹣y2+2x2+3xy的值.
某温度时浓度都是1mol·L-1的两种气体X2Y2在密闭容器中反应生成气体Z.达到平衡时cX2为0.
X2+2Y2 2XY2
2X2+Y2 2X2Y
3X2+Y2 2X3Y
X2+3Y2 2XY3
计算54x2y﹣108xy2﹣36xy÷18xy
下列运算中正确的是
2x+2y=2xy
(x
2
y
3
)
2
=x
4
y
5
(xy)
2
÷
=(xy)
3
2xy﹣3yx=xy
下列计算正确的是
3a
2
+a
2
=3a
4
8xy﹣7xy=xy
3x
2
y﹣xy
2
=2x
2
y
3a+b=3ab
下列计算错误的是
(
-2)
0
=1
28x
4
y
2
÷7x
3
=4xy
2
(4xy
2
-6x
2
y+2xy)÷2xy=2y-3x
(a-5)(a+3)=a
2
-2a-15
下列运算中正确的是
2x+2y=2xy
(x
2
y
3
)
2
=x
4
y
5
(xy)
2
÷
=(xy)
3
2xy﹣3yx=xy
列计算错误的是
(
-2)
0
=1
28x
4
y
2
÷7x
3
=4xy
2
(4xy
2
-6x
2
y+2xy)÷2xy=2y-3x
(a-5)(a+3)=a
2
-2a-15
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