直接写得数.
14÷35 = 4 - = 9981÷49 ≈ 3.4×=
-×0 = 1.25×0.8= 198+256 = 2×÷2×=
5 ÷0.01= 4÷0.25×4= 1.8-0.35 = 1.8:2.4 =