2.3×1.5+4.5÷0.75 (7.5+2.5)÷0.25
[(1)]
3.8×99+3.8 2.8+4.36+5.64 [×(-)]÷
1000—640÷16 12.5×(37×8)
1.25×23×2.5
①0.53×2.5+
②25×0.032×12.5
③ [()×]
④6.83+17.9﹣0.83+32.1
①26×15﹣200
②8×4×12.5×0.25
③×+
④12÷[()×]
①7.4﹣6.62+20.6﹣13.38
②×+×
③(-+)÷
④2×0.8×12.5×50%
⑤÷(÷+)
⑥×[1÷(+)]