24×5= + = 4﹣1.6= 3.14×32=
25×4+25×4= 0+ = +7= × =
2.7+5.4= ﹣ × =
①20﹣5.44﹣4.56
②2.4×1.01
③1÷[(+)÷11]
④×16.31﹣2.31