计算下面各题(能简算的要简算) | ②5+2- |
①1÷ | ④2×12.5× |
③2.8× | ⑥ |
⑤ | ⑧[4 × |
⑦1 | ⑩ |
⑨. |
解①1÷ =1÷ =; ②5+2- =7- =7; ③2.8× =2.8×(5.6+3.4-1) =2.8×8 =22.4; ④2×12.5× =(×)×(12.5×8) =2×100 =200; ⑤ =1-0.8÷0.8 =1-1 =0; ⑥ =; ⑦1 =1÷[0.5×2.5-0.25] =1÷[1.25-0.25] =1÷1 =1; ⑧[4 × =[4-×]× =[4-]× =× =; ⑨ =×63×63 =54-49 =5; ⑩ =(4)×+[-4.8] =36×+[5-4.8] =3+0.2 =3.2. |
科目:小学数学 来源: 题型:
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科目:小学数学 来源: 题型:
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