7\9-4\13*7\9 70*13\51-13*19\51 x-2\5x=0.6 10/(3\4+x)=5 2500比
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7\9-4\13*7\9 70*13\51-13*19\51 x-2\5x=0.6 10/(3\4+x)=5 2500比2000多几分之几 2000比2500少几分之几
急
急
7\9-4\13*7\9
=7/9*(1-4/13)
=7/9*9/13
=7/13
70*13\51-13*19\51
=70*13/51-19*13/51
=(70-19)*13/51
=51*13/51
=13
x-2\5x=0.6
0.6x=0.6
x=1
10/(3\4+x)=5
3/4+x=2
x=1.25
2500比2000多几分之几
(2500-2000)÷2000
=500÷2000
=1/4
2000比2500少几分之几
(2500-2000)÷2500
=500÷2500
=1/5
=7/9*(1-4/13)
=7/9*9/13
=7/13
70*13\51-13*19\51
=70*13/51-19*13/51
=(70-19)*13/51
=51*13/51
=13
x-2\5x=0.6
0.6x=0.6
x=1
10/(3\4+x)=5
3/4+x=2
x=1.25
2500比2000多几分之几
(2500-2000)÷2000
=500÷2000
=1/4
2000比2500少几分之几
(2500-2000)÷2500
=500÷2500
=1/5
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
设函数f(x)=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10),
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
1x()+2x()+3x()+4x()+5x()+6x()+7x()+8x()加9x()+10x()=1980
1X?+2X?+3X?+4X?+5X?+6X?+7X?+8X?+9X?+10X?=1980求?是多少
解方程:(x+3)/(x+2)-(x+5)/(x+4)=(x+7)/(x+6)-(x+9)/(x+8)
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
先化简再求值(x+3x+5x+7x+.+101x)-(2x+4x+6x+...100x),其中x=51分之2
a*b=2×a+b 计算x*2x*3x*4x*5x*6x*7x*8x*9x=3039 x=
x-4/x-6+x-8/x-10=x-5/x-7+x-7/x-9