文档介绍:×49/9-4/×15/36+1/×5/6–2/9××5/4+1/÷3/8–3/8÷×5/9+3/7×5/-(3/2+4/5)+(1/8+1/9)×5/6+5/×8/9-1/×5/49+3/×(1/2+2/3)×4/5+8×11/×5/6–5/-(2/7–10/21)×18–14×2/×25/16+2/3×3/×2/9+1/–3/4×9/×8/7–5/6×12/×3/25+3/××2/3+1/×2/3+5/+1/11÷1/×11/5+4/×2/3+1/3×+12/19×5/+3/4÷2/×21/16+1/×1/5–1/5×+160÷40×(58+370)÷(64-45)+45×2-4160÷-145÷5×6+42420+580-64×21÷2834.(58+37)÷(64-9×5)÷(64-45)×÷×.(-×)÷.(×+)÷-×--(-54-31/)×(-)+×+456+789+98/(-4)(4+6)44.-+(+5/4)+(-)45.(-17/4)+(-10/3)+(+13/3)+(11/3)46.(+)-(+17/7)47.(-)+(+)+(-)+()+(+)+(+)48.|(-5/4)-(-3/4)|-|1-5/4-|-3/4|)49.(-2/199)×(-7/6-3/2+8/3)50.|(-)-(-)+()|×××+×+.〔(-)×-1〕×.〔(-)×-1〕××[(12-)÷(÷)]56.(12+