脱式计算.1650﹣480÷16×15;0.4×7.6×25×100;(﹣)×45;×[0.75﹣(﹣0.25)];2.9×6.7+2.9+2.9×2.3.
0.56×=
÷50%=
11.75- 1.7=
3.6×0.25×4=
÷=