18x=25(0.7x)方程求解
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1.x+60%x=421.6x=42x=26.252.x-25%x=180.75x=18x=243.3x+20%x=483.2x=48x=1.25纯手打
[1-1/(x-4)]+[1-1/(x-8)]=[1-1/(x-7)]+[1-1/(x-5)]1/(x-4)+1/(x-8)=1/(x-7)+1/(x-5)(x-4+x-8)/(x-4)(x-8)=(
0.3x=15解得:x=50
x-0.7x=4.80.3x=4.8x=4.8÷0.3x=16x要对齐.这里的不能对齐所以你要自己写
以x为主元,将方程整理为3x2-(3y+7)x+(3y2-7y)=0,∵x是整数,∴△=[-(3y+7)]2-4×3(3y2-7y)≥0,∴21−1439≤y≤21+1439,∴整数y=0,1,2,3
x-0.7x=4.80.3x=4.8x=4.8÷0.3x=16
2+x=25x=23
10.5+0.7x=x10.5=x-0.7x0.7x=10.5x=10.5÷0.3x=35
2x=150-25-252x=100x=50
(x+x)+(x-x)+(xx)+(x/x)=1002x+0+x²+1=100x²+2x+1=100(x+1)²=10²x+1=10或x+1=-10x=9或x=
方程是啥?如果为:x^0.75-x^0.25=0.75令t=x^0.25,则x^0.75=t^3方程化为:t^3-t=0.75,解得:t=1.26255112740716x=t^4=2.5409486
(1+0.7)x=6.29x=6.29/1.7x=3.7
x+2+x-2+2x+1/2x=184.5X=18X=18/4.5X=18*2/9X=2*2X=4
x^4+2x^3-18x^2-10x+25=0x^4-x^3+3x^3-3x^2-15x^2+15x-25x+25=0(x-1)(x^3+3x^2-15x-25)=0(x-1)(x^3+5x^2-2x
两边除以8025x²+50x=1x²+2x=1/25x²+2x+1=1/25+1=26/25(x+1)²=(±√26/5)²x+1=±√26/5x=-
X×2.4+X×18=21.420.4x=21.4x=21.4/20.4x=107/102
1-925+144-25*9+144=-225+144=-81x=9或-144/25(方法,首先25不能分成5*5,因为如果这样,中间的数怎么也得不到81.其次1296=9*9*16,试算一下即可)