【简答题】23+0.23+0.23+0.23=______×______,积是______位小数.
【简答题】(0.12+0.23+0.34)×(0.23+0.34+0.45)-(0.12+0.23+0.34+0.45)×(0.23+0.34)=______.
【单选题】-025,-345,+327,0.23,n,-20 0 5 不是正数有( )个.
【简答题】口算. 0.07÷O.7= 5.4÷0.6= 3.4×0.1= 0.35×0.2= 1.23×0.23×0= 0.8-0.8×0.9=
【简答题】直接写出得数 44÷ 11 10 = 1÷50%= 100×0.1%= 98-0.23-0.77= 4 5 + 4 5 ÷ 4 5 =
【简答题】(1+0.12+0.23)×(0.12+0.23+0.34)-(1+0.12+0.23+0.34)×(0.12+0.23)=______.