优优班--学霸训练营 > 知识点挑题
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            • 1. 用简便方法计算
              (1)0.9999×0.7+0.1111×2.7;
              (2)(1+0.228-0.21)×(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)×(0.228-0.21)
            • 2. (1)(7.2×7.5×5.4)÷(2.4×1.5×2.7);
              (2)1+3+5+7+…+2009;
              (3)解方程:
              2x+6.8
              5
              =
              x-3
              2

              (4)
              1
              2
              +
              3
              4
              +
              7
              8
              +
              15
              16
              +
              31
              32
              +
              63
              64
              +
              127
              128
              +
              255
              256
            • 3. 简便计算
              4.75-9.63+8.25-1.37        
              81.5×15.8+81.5×51.8+67.6×18.5     
              99999×26+33333×22.
            • 4. 0.1÷0.1÷0.1÷0.1÷0.1÷0.1÷0.1.
            • 5. 计算:
              (1+0.12+0.23)×(0.12+0.23+0.34)-(1+0.12+0.23+0.34)×(0.12+0.23)=
              66.6×7.6+334×0.24+13.36×38=
              998877+988776+887766+877665+776655+766554+665544+655443=
              (1×2×3×4×…×9×10×11)÷(28×27×25×24×22)=
              1.23452+0.76552+2.469×0.7655=
            • 6.
                    •
              0.11
              +
                     •
              0.12
              +
                     •
              0.13
              +…
                    •
              0.18
              +
                    •
              0.19
              ﹙以最简分数表示﹚
            • 7. 0.1+0.2+0.3+…+0.9+0.10+0.11+…0.98+0.99.
            • 8. 232.14+64.28×0.5378×0.25+0.5378×64.28×0.75-8×64.28×0.125×0.5378=    
            • 9. 计算
              (0.1+0.12+0.123+0.1234)×(0.12+0.123+0.1234+0.12345)-(0.1+0.12+0.123+0.1234+0.12345)×(0.12+0.123+0.1234)
            • 10. 计算下列各题,能简便的要简便
              (1)4×
              3
              7
              +3×
              5
              9
              -5×
              3
              7
              +1×
              4
              9
              +1×
              4
              7

              (2)2008×
              2006
              2007

              (3)2-
              6
              13
              ÷
              9
              26
              -
              2
              3

              (4)0.25×1.25×320
              (5)0.6×47+52×
              3
              5
              +0.6
              (6)9.75+99.75+999.75+9999.75.
            0/40

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