答:原式=25x(4+0.1)=25x4+25x0.1=100+2.5=102.5
答: 40%x+4=600.4x=60-40.4x=56x=140x÷(1-46)=27分之25x/45=25/27x=125/3x-12%x=2.8160...
答:2logx25-3log25x=1用lg(log以10為底)進(jìn)行換底,2lg25/lgx-3lgx/lg25=1兩邊乘lg25*lgx,3(lgx)^2+lg25*lgx...
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