4x+20=76 3x-15=27 7x-3乘5=55 7x+2=4.5 4x-1.5x=22.5 2(x-1.3)=8

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4x+20=76 3x-15=27 7x-3乘5=55 7x+2=4.5 4x-1.5x=22.5 2(x-1.3)=8 (x+3)除以2=6.5
是方程哦

4x+20=76
4x=76-20
4x=56
x=56÷4
x=14
3x-15=27
3x=27+15
3x=42
x=42÷3
x=14
7x-3乘5=55
7x-15=55
7x=55+15
7x=70
x=70÷7
x=10
7x+2=4.5
7x=4.5-2
7x=2.5
x=2.5÷7
x=5/14
4x-1.5x=22.5
(4-1.5)x=22.5
2.5x=22.5
x=22.5÷2.5
x=9
2(x-1.3)=8
x-1.3=8÷2
x-1.3=4
x=4+1.3
x=5.3
(x+3)除以2=6.5
x+3=6.5×2
x+3=13
x=13-3
x=10

4x+20=76 3x-15=27 7x-3乘5=55 7x+2=4.5 4x-1.5x=22.5 2(x-1.3)=8 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 2x+3x+4x+5x+x+6x+7x=100 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 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) （1） 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