2.5*4-0.25x=8.5
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4x-15=2.5x+151.5X=30X=20
是这样的:x^5+x^4=x^3(x^2+x)=(x^2+x)[(x^3-1)+1]=(x^2+x)(x^3-1)+x^2+x=[x(x+1)(x-1)](x^2+x+1)+x^2+x=(x^3-x)
6x=24x=41.58*4=6.3210x=8x=0.870*0.8-29.5=26.5再问:确定答案吗?直接采纳喽
x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊
2x+3x+4x+5x+x+6x+7x=10028x=100x=100/28x=25/7
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设x1=4-√3,x2=4+√3,是方程X^2-8X+13=0的两根所以X1^2-8X1+15=2X^4-6X^3-2X^2+18X+23=(X+1)^2*(X^2-8X+13)+10=10所以原式=
7x-2.5x+3x-1.5x=-15×4-6×3(7-2.5+3-1.5)x=-60-186x=-78x=-13
4x-2.5x=151.5x=15x=15/1.5x=10
解4-x=2(-0.5x²+2.5x-2)4-x=-x²+5x-4x²-6x+8=0(x-4)(x-2)=0∴x=4或x=2
3x+0.5x=4.23.5x=4.2x=4.2÷3.5x=1.24x-2.16=1.24x=3.36x=0.84x-0.2x=160.8x=16x=202x-4x乘以2.5=3.62x-10=3.6
8x-4x=0.644x=0.64x=0.64÷4x=0.160.2x-x=416-0.8x=416x=416÷(-0.8)x=-5207x+2.5x=3.89.5x=3.8x=3.8÷9.5x=0.
两边同时除以6^x,则(4/6)^x+(6/6)^x>(9/6)^x(2/3)^x+1>(3/2)^x,令(2/3)^x=y且y>0y+1>1/yy^2+y-1>0因为y>0,解得y>[5^(1/2)
3.5X+2.5(14-X)=43.5x+35-2.5x=43.5x-2.5x=4-35x=-31
1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1=(1/2x^2-0.5x^2)+(0.25x-1/4x)+(0.2x^3-1/5x^3)+0.5x-1=0.
4×(0.8+x)=723.2+4x=724x=72-3.24x=68.8x=68.8÷4x=17.28x+2x=31.410x=31.4x=31.4÷10x=3.14(x+1.8)÷4=2.5(x+
能不能先用()把每个分数括起来?
10.5(X-4)=2.5X10.5X-42=2.5X10.5X-2.5X=428X=42X=42÷8X=5.25
10.5x-2.5x=10.5*48x=42x=5.2
7X-2.5X+3x-1.5x=-15*4-6*36x=-78x=-13