÷50%=
125×(8+0.8+0.08) 45÷〔78-(25+38)
1.3-3.79+9.7-6.21 8×0.4×12.5×2.5
19175÷59+678 36.5×1.4-8.51
()÷20-[(
14.8×6.3-6.3×6.5+8.3×3.718.1+(3-0.299÷0.23)×1