[425 -(2.5+1.9) ×0.5]-0.5 1213 -412 -214 -518 -12.5% 0.125×34 +18 ×8.25+12.5% (78 +1316 )÷1316 2.5×37 ×0.4×213 15314 -2.25-734 89 ×[1516 +(716 -14 )÷12 ]
157 ×(5÷56 -56 ÷5) 0.84÷0.3÷(1.96×18.9) 2.5÷8+9.5×18 +4×0.125 [2.1+7÷(3112 -1.625)] ×123 2.5×25 -2.1÷13 +9.63 (9.5+912 +912 +9.5) ×1212
(313 +34 -258 )÷(115 ÷80%) (4.2÷0.7+6×125 )×526
(0.25+2.5+25)×0.4 12.5＋5×8×20 6.4×3.28+4.6×3.28-3.28