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x乘4加50等于178,x等于多少?用方程怎么解?

4x+50=178 4x=178-50=128 x=128/4=32

x+1.02x=178.77 2.02x=178.77 x=178.77÷2.02 x=88.5

解: x²=x => x²-x=0 => x(x-1)=0 => x=0 或 x=1

x²-(k+1)x+k²/4+1=0. 4x²+(4k+4)x+k²+4=0 若|x1|=x2,x1≥0,则x1=x2 △=16(k+1)²-16(k²+4)=0,解得k=3/2(此时x=5/4). 若x1

x(x+1)(x+2)(x+3)=3024 (x²+3x)(x²+3x+2)-3024=0 (x²+3x)²+2(x²+3x)-3024=0 (x²+3x+56)(x²+3x-54)=0 (x²+3x+56)(x-6)(x+9)=0 x²+3x+56=0 (无解) x-6=0 x+9=0 所以 x1=6 x2=-9

x(x-1)/2=36 x(x-1)=36*2=72 x²-x=72 x²-x+(1/2)²=72+(1/2)²=72+1/4=289/4 (x-1/2)²=289/4 x-1/2=±√(289/4)=±17/2 x=1/2±17/2=(1±17)/2 x1=(1+17)/2=18/2=9 x2=(1-17)/2=-16/2=-8

m/(x²-4) - 1/(x+2) = 0 m/(x²-4) - (x-2) /(x²-4) = 0 (m-x+2) /(x²-4) = 0 {x-(m+2)} / {(x+2)(x-2)} = 0 ∵方程无解 ∴m+2=-2,或m+2=2 ∴m=-4,或m=0

2x²-3x-3=0 x²-3x/2=3/2 (x-3/4)²=3/2+9/16 x-3/4=±√33/4 x1=3/4+√33/4 x2=3/4-√33/4

(10+x)(500-10x)=800 10(10+x)(50-x)=800 500+50x-10x-x²=80 x²-40x=420 x²-40x+400=420+400 (x-20)²=820 x-20=±√820 x=20±2√205

您好: x-1/x+5=x+5/x-1 (x-1)² =(x+5)² (x+5)² -(x-1)² =0 (x+5+x-1)(x+5-x+1)=0 6(x+4)=0 x=-4 如果本题有什么不明白可以追问,如果满意记得采纳 如果有其他问题请采纳本题后另发点击向我求助,答题不易,请谅解,谢...

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