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19又2分之1x加3又2分之1乘2等於7 x*39/2+7/2*2=7 x*39/2=7-7 x=0/(39/2) x=0
由題意得: 比x的4倍少2.5的數是4x-2.5 當x=1.8時4x-2.5=4*1.8-2.5=4.7
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