一个数的一半是,这个数是多少?
用竖式计算. 2.58+3.47 6.2﹣4.95 7.6×0.24 8.84÷1.7 3.05×0.66 3.9÷0.65.
口算 0.6+1.3= 8.9﹣5= 2+0.78= 8×0.9= 0.32×0.2= 32.1×0.3= 7.5﹣0.3= 3.2÷0.08= 5.6÷7= 9.5﹣7.65= 8.4÷0.2= 5.8+4.6=
接写出得数. 5.2+0.5= 7﹣0.06= 5.6÷7= 8.3﹣5.7= 1.06+9.4= 4.04÷4= 2.5×0.4= 9.93+0.1= 10﹣2.3= 0.18÷6= 6÷4= 0.24×5= 0.3×0.3= 2÷0.2= 15÷0.5= 20÷0.7=
口算: 7.2+1.8﹦ 0.45÷10﹦ 0.125×8﹦ 9.6÷0.96﹦ 3÷0.5= 5﹣3.2﹦ 6×0.5﹦ 6.3÷0.9= 0.1﹣0.01﹦ 16×0.125=
用竖式计算,并验算. 37.25+14.78验算: 6.75﹣2.89验算: 1.06×4.7验算: 18.9÷0.54验算: