①18.5-3.21 -4.79
②(80-0.8)×1.25
③4.5×6.7+5.5×6.7
④16.39-(9.4-3.61)
15.8×69.3-68.3×15.8
1.25×4×2.5×8
1.2×2.5+0.8×2.5
①4.85×1.25×8
②76.8-27.24-12.76
③0.37×7.4+9.63×7.4
①3.6+14×45
②4.7×0.36+0.36×5.3
③2.5×32×1.25
④5.72-3.08-1.33
⑤53.2-6.3-3.7
⑥18.69-28.9×0.4
①0.53×2.5+
②25×0.032×12.5
③ [()×]
④6.83+17.9﹣0.83+32.1
①25×32×1.25
②(+0.375)÷(×)
③×+÷7
④6﹣(+)
①26×15﹣200
②8×4×12.5×0.25
③×+
④12÷[()×]