40%(x+30)=50%x4(x+30)=5x4x+120=5xx=120
40%X=(X+50)*30%40%X=30%X+1510%X=15X=150
30%x+30%x-15=50%x0.6X-15=0.5X0.1X=15X=150
30%x+50%x=32 0.3x+0.5x=320.8x=32 x=32÷0.8 x=40
根据题意,进行左右移项,原式转换为:30%x+20%x=100-40,继续为:50%x=60,x=60/50%,所以x=120.
30%x+100=50%两边减100得30%x=50%-100=99.5两边除以30%得x=99.5÷30%=995/3
(1-40%-畅俯扳谎殖荷帮捅爆拉25%)x=(40%-25%)x*2+400 得0.35x=0.3x+400则0.05x=400, x=400/0.05=8000
(40-x)/(50+x)=50%2*(40-X)=(50+X)*180-2X=50+X3X=30 X=10
30%x+(30%x-76)=50%x0.6x-76=0.5x0.1x=76x=760
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