①0.25×1.56×4
②0.74×99+0.74
③7.5÷1.5×1.3
④2.74÷0.125÷8
⑤12.5×7.2
⑥27.3÷[(7.4-6.8)×1.3]
12﹣3.6= 12×0.5= 36×25%= ×6+=
+= ÷4= 0××5= 28÷1.25÷8=