1080 * 1.5% * (x-20) = 81的过程是什么
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(20-2x)(20-2x)x>400400-80x+4x²>400x²-20x>0x(x-20)>0x<0x>20
1.3×35%+8.7÷七分之二十=1.3x0.35+8.7x7/20=1.3x0.35+8.7x0.35=0.35x(1.3+8.7)=0.35x10=3.5解方程:0.25+25%x=1.50.2
(1.5X-20)-(X+20+25)=401.5x-20-x-45=400.5x-65=400.5x=40+650.5x=105x=210
1)x-10=4(x-28)x-10=4x-1123x=102x=342)3(x-28)=x+56+283x-3*28=x+2*28+282x=6*28x=3*28x=843)2(1.5x-30-20
80/x-80/1.5x=20①:80/x-80/(3/2)x=20②:80/x-160/3x=20③:240/3x-160/3x=20④:80/3x=20⑤:x=4/3
0.4(x-0.2)+1.5=0.7x-0.380.4x-0.08+1.5=0.7x-0.380.3x=1.8x=6(0.6x+420)÷(x+20)=33(x+20)=0.6x+4203x+60=0
原方程可化为100*{(X+X*20%)-[(1200-X)-(1200-X)*20%]}=40%*100100*120%X-100*[(1200-X)-(1200-X)*20%]=40120X-10
一元一次方程都不会解?再问:拜托说一下,今晚就要用再答:1.移项,得,5x≤-125,不等式两边同除以5,得x≤-25.2.移项,得,-2x>-6,不等式两边同除以-2,得x-4,即-8x>-4,不等
X+X*20%-(1200-X)-(1200-X)*20%=40%,等式左右同时乘以100得100X+X*20-100*(1200-X)-(1200-X)*20=40120X-(1200-X)*120
4X-3(20-X)=5Xx=300.2分之X-2=3x=1九分之八×18-五分之一X=1.5x=67.50.5X+7分之1.2=3X分之1.6x=0.875498orx=-1.21835
4x+20=764x=76-204x=56x=56÷4x=143x-15=273x=27+153x=42x=42÷3x=147x-3乘5=557x-15=557x=55+157x=70x=70÷7x=
(x-22)+(x-24)+(x-27)+(x-20)=xx-22+x-24+x-27+x-20=x4x-93=x4x-x=933x=93x=31
x+20=1.5xx-1.5x=-20-0.5x=-20x=20/0.5x=40
您好!1.5X*80%=X+201.2x=x+200.2x=20x=100
4X-24=2X+202X=44X=222X(X-0.7)=4.82X²-1.4X-4.8=0X²-0.7X-2.4=0∵a=1.b=-0.7c=-2.4,Δ=(-0.7)&sup
1.5X+20=1X(50-X)1,5x+20=50-x1.5x+2=50-202.5x=30x=12
1.5(x+1200)-x=20%x1.5x+1800-x=0.2x1.5x-x-0.2x=-18000.3x=-1800x=-1800÷0.3x=-6000
各分式减1,得1/(x+2004)+1/(x+2006)=1/(x+2007)+1/(x+2003),通分得(2x+4010)/[(x+2004)(x+2006)]=(2x+4010)/[(x+200
0.88x+0.88*20%x=x+841.056x=x+84x=1500