10又1/2÷35+2.8×1/7 脱式计算

问题描述:

10又1/2÷35+2.8×1/7 脱式计算

10又1/2÷35+2.8×1/7 =21/2÷35+0.4 =3/10+0.4 =0.3+0.4 =0.7