书包:294-154=140 140÷(6-2)=35元水彩笔:(154-35×2)÷3 = 84÷3 =28元
6-2=4(个)294-154=140(元)书包:140\4=35(元)水彩:154-2*35=84(元)答:书包:35,水彩84
书包(294-154)/(6-2)=35 (154-2*35)/3=28
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