4x+0.5*5=9.5 0.25x*3=0.3x20.25x+3=0.3x+2
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4x+0.5*5=9.5 0.25x*3=0.3x20.25x+3=0.3x+2
4x+0.5*5=9.5 0.25x*3=0.3x2
0.25x+3=0.3x+2
4x+0.5*5=9.5 0.25x*3=0.3x20.25x+3=0.3x+2
4x+0.5*5=9.5
4x+2.5=9.5
4x=9.5-2.5
4x=7
x=7/4
7
____(四分之七)
x= 4
0.25X*3=0.3*2
0.75X=0.6
x=0.6/0.75
x=0.8
4x+0.5*5=9.5
4x+0.25=9.5
移项,得4x=9.5-0.25
合并同类项,得4x=9.25
系数化为一,得x=2.3125
0.25x*3=0.3x2
0.75x=0.6
系数化为一,得x=0.8
4x+0.5*9=9.5
解:4x=9.5-0.5*9
x=(9.5-0.5*9)/4
x=5/4=1.2
0.25x*3=0.3x2 (0.3x2还是0.3*2)
0.25x=0.3*2/3
x=0.3*2/3/0.25=??
求1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 其中x=12/13
求1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 其中x=12/13
4x+0.5*5=9.5 0.25x*3=0.3x20.25x+3=0.3x+2
(x+2)(x-1)+(x+3)(x+1)=x·x-1 求x (5x-4)(2x+5)(3x-6)(2x-4)=(2x-4)(2x+5)·0.5 求x
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
(x-3/x-2)-(x-2/x-1)=(x-5/x4) -(x-4/x-3)
x-2x+3x-4x+5x.+99x-100x=25求解
2x+3x+4x+5x+x+6x+7x=100
x(x+1)+(x+2)+(x+3)+(x+4)+(x+5) = 27求x
12x-2/21x=快点9点之前还有7x-x+2/3x-3(4x-0.5)-2x+(3x-1)-(x+5)
1.8+x=2 x=?x-7.5=2.5 x=?1.2x=4.8 x=?x/0.5=12 x=?x+1.2=9.6 x=?0.3x+9=12 x=?6+4x=30 x=?9.5x-4.5x=30x=?4(x-3)=48x=?12x-10x=48x=?5.2x+4.8x=81x=?(x+5)*7=42x=?在1、2、4、11、12、9、15、21、23、91这些数中:素数有( ).合数有( ).
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x-3/4x=(108-x)-4/5x
4x-3x(20-x)=5x
(X-5)(X+3)+(X-2)(X+4)=26