2(x+1)>5x 答案:x<2/33(x-2)<2x-17答案:x<-114(y-3)+7<-13-3(2y+1)答案:y<-1.110-2(x-1)<3(x-1)-25答案:x>82x-8<4x-7答案:x>-1/22(x+9)>3(1-x)答案:x>-31-7(y+2)<2(y-1)+5答案:y>16/9x-1/2(x+1)>10答案:x>211-x/4<5+(x-2)/6答案:x>44/5(x-2)/5-(x+3)>(2x-5)/3-3答案:x<72x+2y=44x+3y=26答案:x=20,y=21/3y+x=441/4x+y=44答案:x=32,y=36400-x=4(150-y)x:y=2:1答案:x=200,y=100x+y=9540%x+78%y=60&·95答案:x=45,y=503x+20=y4x-30=y答案:x=50,y=1706x+5y=-12x-3y=-5答案:x=-1,y=13x-2y=53x+2y=13答案:x=3,y=24x-5y=52x+3y=-25答案:x=-5,y=-52x+3y=-73x+2y=7答案:x=7,y=-73x+5y=-25x-3y=8答案:x=1,y=-1(x-9)/4=(x+5)/3答案:x=-479x/16=3x/4+3答案:x=-16(1+x)/3-2x=8-(x+8)/4答案:x=-4x+(x-1)/2=(2x-1)/3-1答案:x=-14%x+8%=6%x-0.4答案:x=243(1-x)+2x=5答案:x=-27(x-2)=2x-34答案:x=-41/2m+3=1答案:m=-42-1/3(k-1)=2答案:k=1x+x+x+1=x+2+x+3答案:x=4
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