作业帮{5x-3(20-x)≥70,5x-3(20-x)≤90
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{5x-3(20-x)≥70,5x-3(20-x)≤90
{5x-3(20-x)≥70,5x-3(20-x)≤90
{5x-3(20-x)≥70,5x-3(20-x)≤90
据题意,70≦5x-3(20-x)≦90
70≦8x-60≦90
130≦8x≦150
16.25≦x≦18.75
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填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x
通分:x+4/x^2-8x+15,x-5/x^2+x-12,x-3/x^2-x-20
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
{5x-3(20-x)≥70,5x-3(20-x)≤90
求余数1.(x平方-2x+3)除以(2x+3)2.(x五次方-1)除以(x-2)3.21x五次+33x四次-70x三次+21x平方+x-1)除以x分解因式2x三次+5x平方2x-94x三次-15x平方+8x+3x四次-5x三次+20x-16x四次-2x平方+3x-2x五次-10x平方+15x-6若有若(
4x-3x(20-x)=5x
|x-5|+|x-3|
3x-|x+5|
(x+3)(x-5)
3(x^4)^6-2(x^5×x^3)^3+x^11×x^13+x^20×x^3×x
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
(x+3x+5x...+2009x)-(2x+4x+6x+...+2010x)
4x-3x(20-x)=5x-7x(20-x)
4x-3x(20-x)=5x-7x(20-x)的解法
x/x-3-5x/x^2-x-6计算
x^5-x^4+x^3-x^2+x-1
求一个数独答案X X X 9 X X X 8 2 X 6 3 X X 1 4 X 99 X 8 X X X X X XX X X 6 7 X 3 X XX 4 6 X 5 X 2 9 XX X 7 X 2 3 X X XX X X X X X 7 X 17 X 4 3 X X 6 2 X6 3 X X X 7 X X X