(a＋b)＋c=a＋(b＋c)2.73＋0.89＋1.274.37＋0.28＋1.63＋5.72a－b－c=a－(b＋c)10－0.432－2.5689.3－5.26－2.7414.9－(5.2＋4.9)18.32－5.47－4.32(a×b)×c=a×(b×c)25×6.8×0.040.25×32×0.1256.4×1.25×12.5c×(a+b)=c×a＋c×b0.45×2010.58×10.150.2×9910.7×16.1-1.1×10.7+10.7×523×0.1＋2.3×9.93.28×5.7＋6.72×5.72.1×99＋2.10.18＋4.26－0.18+4.260.58×1.3÷0.58×1.37.3÷4＋2.7×0.25a÷b÷c=a÷(b×c)930÷0.6÷563.4÷2.5÷0.4(7.7＋1.54)÷0.70.25×16.2×46.9＋4.8＋3.115.89＋(6.75－5.89)7.85＋2.34－0.85＋4.664.8×100.135.6－1.8－15.6－7.213.75－(3.75＋6.48)47.8－7.45+2.5566.86－8.66－1.340.25×32×0.1252.5×(4+0.4)4.7×9.956.5×9.9＋56.57.09×10.8－0.8×7.093.83×4.56＋3.83×5.443.65×4.7－36.5×0.375.4×11-5.4(1.25－0.125)×813.7×0.25－3.7÷44.2×9942×125×8×525×4×88×12545×37+37×5528×21+28×7999×78197+102127-98517-53-4717×23-23×738×46+64×3899×32+3292+9946+46×59167×2+167×3+167×539×8+6×39-39×4323+189-123248-86+48672-36+64(6467-832)+(1832-1467)354-108405-9928×225-2×225-6×225(42+25)×125+(18+15)×12599×22+33×3423×2×4+25×4×2+27×1×8+25×8×123×5×2272+68+28360÷4÷9250÷5÷2600÷12÷51000÷(125÷4)960×46÷48800÷5÷8480÷5÷48240÷5÷1265+73+135357+288+143125×(860+240÷12)700+612÷12×4(37+15)×85+1360(250-25)÷251530+(592-530)-192(2+4+6+……+98+100)-(1+3+5+……+97+99)(230-23)÷231736÷28+1064÷282005×20062006-2006×20052005129+235+171+16517+145+23+35999+99+9+3284-159-41258-42-16545-167-145478-47-17845×4×5344-(144+37)236-(177+36)25×9×48×(125×13)400-256-4488×12542×2572×125(250×125)×(4×8)76×10325×44125×64×2542×125×8×525×4×88×12599×918×12599×7845×37+37×5528×21+28×792400÷257000÷125323+189-123248-86+4817×23-23×738×46+64×3899×32+323.12＋3.12×9946+46×59167×2+167×3+167×539×8+6×39-39×4360÷4÷9250÷5÷2600÷12÷5147＋147×99800÷5÷8480÷5÷48240÷5÷12420÷35672-36+64(6467-832)+(1832-1467)1530+(592-530)-19299+999+9999+99999123×18－123×3+85×1237755－(2187+755)2.64＋8.67＋7.36＋11.3363.4÷2.5÷0.487×53＋87×4728.6×101－28.688×27＋27×12167×25＋32×25＋2538×99＋387×75－7×25234―34―66528―53―47435－(135＋189)25×(4＋8)108×7535×201250÷8×475