选用合适的方法计算:6.02+3.6+1.98 1.29+3.7+2.71+6.3 3.07﹣0.38﹣1.623.25+1.79﹣0.59+1.75 7.5+4.9﹣6.1 14.8+7.9﹣4.8.
口算. 3.2×0.2 1.4×0.4 3.3÷3 1.2÷0.3 5.6÷0.4 2.5×0.4 1.5×2 7.3+2.7 8.4÷0.7 4.5÷0.9 0.53﹣0.3 7.8÷6 8.4÷0.21 0.6×0.5 8.1×2 5.6+3.6 9﹣2.350.56÷8 1.23×3 12.5÷0.1.
直接写得数. 2.5×4= 0.25×3= 2.8×0.2= 2.4÷0.3= 4.6÷0.2= 0.32÷0.08= 7.2÷0.6= 0.06×15= 0.25×4×0.4= 7×2.6+7×0.4=
竖式计算,得数保留两位小数. 0.38×0.65 6.18×0.99 4.8÷2.3 23.5÷0.18.
列竖式计算,除法保留两位小数. 9.75×1.5 1÷6 13÷2.4 0.59×0.27.
用竖式计算. 3.49+2.15 7.4﹣3.68 5.3×0.26 0.453÷0.15.