19x-8x=55 2×(7x-4x)=18 6x+8x=1.4×3 5x+0.1x=50+6.1 7.2x-3.6x=
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/09/30 14:33:11
19x-8x=55 | 2×(7x-4x)=18 | 6x+8x=1.4×3 |
5x+0.1x=50+6.1 | 7.2x-3.6x=9×0.4 | 20=5x-3X. |
(1)19x-8x=55,
11x=55,
11x÷11=55÷11,
x=5;
(2)2×(7x-4x)=18,
2×3x=18,
6x÷6=18÷6,
x=3;
(3)6x+8x=1.4×3,
14x=4.2,
14x÷14=4.2÷14,
x=0.3;
(4)5x+0.1x=50+6.1,
5.1x=56.1,
5.1x÷5.1=56.1÷5.1,
x=11;
(5)7.2x-3.6x=9×0.4,
3.6x=3.6,
3.6x÷3.6=3.6÷3.6,
x=1;
(6)20=5x-3x,
2x=20,
2x÷2=20÷2,
x=10.
11x=55,
11x÷11=55÷11,
x=5;
(2)2×(7x-4x)=18,
2×3x=18,
6x÷6=18÷6,
x=3;
(3)6x+8x=1.4×3,
14x=4.2,
14x÷14=4.2÷14,
x=0.3;
(4)5x+0.1x=50+6.1,
5.1x=56.1,
5.1x÷5.1=56.1÷5.1,
x=11;
(5)7.2x-3.6x=9×0.4,
3.6x=3.6,
3.6x÷3.6=3.6÷3.6,
x=1;
(6)20=5x-3x,
2x=20,
2x÷2=20÷2,
x=10.
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
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
已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值
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),
解方程:(x+3)/(x+2)-(x+5)/(x+4)=(x+7)/(x+6)-(x+9)/(x+8)
(X+2)/(X+1)-(X+4)/(X+3)=(X+6)/(X+5)-(X+8)/(X+7)
解方程 x+2/x+1+x+8/x+7=x+6/x+5+x+4/x+3
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
2x+3x+4x+5x+x+6x+7x=100
x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=?