谁能帮我做这几道数学题?要过程!!!!
1.先化简,再求值x²-16分之4÷x-4分之2+x+4分之xx=32.(x-1分之x²-x-1分之2x)÷x-1分之x3.解方程x+3分之2+2分之...
1
.先
化简,再求值 x²-16分之4 ÷ x-4分之2 + x+4分之x x=3
2.(x-1分之x² - x-1分之2x)÷x-1分之x
3.解方程x+3分之2 +2分之3=2x+6分之7
4.2x-1分之10 + 1-2x分之5=2
5.x²-1分之x ÷ x²+x分之x²
6.(xy-3x)(xy-3x)(2xy-y)
一定要过程哈!刚才忘打题了......... 答好了追加分 展开
.先
化简,再求值 x²-16分之4 ÷ x-4分之2 + x+4分之x x=3
2.(x-1分之x² - x-1分之2x)÷x-1分之x
3.解方程x+3分之2 +2分之3=2x+6分之7
4.2x-1分之10 + 1-2x分之5=2
5.x²-1分之x ÷ x²+x分之x²
6.(xy-3x)(xy-3x)(2xy-y)
一定要过程哈!刚才忘打题了......... 答好了追加分 展开
3个回答
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你这么读题很难理解的,可以带括号啊
( )分之( )+( )分之( ),知道了?
1、=(x+4)(x-4)分之4 × 2分之(x-4)+ (x+4)分之x
=(x+4)分之2 + (x+4)分之x
=(x+4)分之(x+2)
把x=3带入,得(3+2)÷(3+4)=七分之五
2、=(x-1)分之x² × x分之(x-1) - (x-1)分之2x × x分之(x-1)
=x-2
3、解,左边通分
(2x+6)分之(2×2+3×(x+3))=(2x+6)分之7
4+3x+9=7
3x=-6
x=-2
4、解(2x-1)分之10 - (2x-1)分之5=2
(2x-1)分之5=2
2x-1=2.5
2x=3.5
x=1.75
5、(x²-1)分之x × x²分之(x²+x)
=(x+1)(x-1)分之x × x²分之x(x+1)
=(x-1)分之1
6、最后一题是化简吗?提取公因数
=x²y(y-3)²(2x-1)
( )分之( )+( )分之( ),知道了?
1、=(x+4)(x-4)分之4 × 2分之(x-4)+ (x+4)分之x
=(x+4)分之2 + (x+4)分之x
=(x+4)分之(x+2)
把x=3带入,得(3+2)÷(3+4)=七分之五
2、=(x-1)分之x² × x分之(x-1) - (x-1)分之2x × x分之(x-1)
=x-2
3、解,左边通分
(2x+6)分之(2×2+3×(x+3))=(2x+6)分之7
4+3x+9=7
3x=-6
x=-2
4、解(2x-1)分之10 - (2x-1)分之5=2
(2x-1)分之5=2
2x-1=2.5
2x=3.5
x=1.75
5、(x²-1)分之x × x²分之(x²+x)
=(x+1)(x-1)分之x × x²分之x(x+1)
=(x-1)分之1
6、最后一题是化简吗?提取公因数
=x²y(y-3)²(2x-1)
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x²-4/16 ÷x-2/4+x+x/4
=x²-1/4x-1/2+x+1/4x
=x²+x-1/2
当x=3时
原式=3²+3-1/2
=9+3+0.5
=12.5
.(x²/x-1 - x-2x/1)÷x-x/1
=(x²/x-1 - x-2x/1)x1/x-x/1
=[(x²/x-1) - x-2x/1]x1/x-x/1
=[x²/(x-1) - x-2x]x1/x-x
=x²/(x²-x) - 1-2-x
=x²/(x²-x)- 1-2-x
= 1-x-1-2-x
= -2x-2
x+2/3+3/2=2x+7/6
x+13/3=2x+7/6
-x=7/6-13/3
x=19/6
2x-10/1 + 1-5/2x=2
2x-10+ 1-5/2x=2
2x-5/2x=2+10-1
2x-5/2x=11
2x²-5/2 =11x
2x²-11x =5/2
=x²-1/4x-1/2+x+1/4x
=x²+x-1/2
当x=3时
原式=3²+3-1/2
=9+3+0.5
=12.5
.(x²/x-1 - x-2x/1)÷x-x/1
=(x²/x-1 - x-2x/1)x1/x-x/1
=[(x²/x-1) - x-2x/1]x1/x-x/1
=[x²/(x-1) - x-2x]x1/x-x
=x²/(x²-x) - 1-2-x
=x²/(x²-x)- 1-2-x
= 1-x-1-2-x
= -2x-2
x+2/3+3/2=2x+7/6
x+13/3=2x+7/6
-x=7/6-13/3
x=19/6
2x-10/1 + 1-5/2x=2
2x-10+ 1-5/2x=2
2x-5/2x=2+10-1
2x-5/2x=11
2x²-5/2 =11x
2x²-11x =5/2
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你这么读题很难理解的,
x2-4/16 ÷x-2/4+x+x/4
=x2-1/4x-1/2+x+1/4x
=x2+x-1/2
当x=3时
原式=32+3-1/2
=9+3+0.5
=12.5
.(x2/x-1 - x-2x/1)÷x-x/1
=(x2/x-1 - x-2x/1)x1/x-x/1
=[(x2/x-1) - x-2x/1]x1/x-x/1
=[x2/(x-1) - x-2x]x1/x-x
=x2/(x2-x) - 1-2-x
=x2/(x2-x)- 1-2-x
= 1-x-1-2-x
= -2x-2
x+2/3+3/2=2x+7/6
x+13/3=2x+7/6
-x=7/6-13/3
x=19/6
2x-10/1 + 1-5/2x=2
2x-10+ 1-5/2x=2
2x-5/2x=2+10-1
2x-5/2x=11
2x2-5/2 =11x
2x2-11x =5/2
x2-4/16 ÷x-2/4+x+x/4
=x2-1/4x-1/2+x+1/4x
=x2+x-1/2
当x=3时
原式=32+3-1/2
=9+3+0.5
=12.5
.(x2/x-1 - x-2x/1)÷x-x/1
=(x2/x-1 - x-2x/1)x1/x-x/1
=[(x2/x-1) - x-2x/1]x1/x-x/1
=[x2/(x-1) - x-2x]x1/x-x
=x2/(x2-x) - 1-2-x
=x2/(x2-x)- 1-2-x
= 1-x-1-2-x
= -2x-2
x+2/3+3/2=2x+7/6
x+13/3=2x+7/6
-x=7/6-13/3
x=19/6
2x-10/1 + 1-5/2x=2
2x-10+ 1-5/2x=2
2x-5/2x=2+10-1
2x-5/2x=11
2x2-5/2 =11x
2x2-11x =5/2
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