简便计算 例1:1.3×12.5×8×4 例2:0.125×0.125×... ×0.125×8×8×...8×2×2×2 10个0.125 9个8 例3:1.6×2.64+1.6×6.36+1.6 例4: 4.2×6.7+6.7×1.2+3.3×5.4 例5: 9.96×1.4 例6: 3.6×5.4+7.2×2.3 例7:2.3+2.7+3.1+...+12.7+13.1 例8: 0.1+0.3+0.5+0.7+0.9+0.11+0.13+...+0.97+0.99 例9:求0.9+9.9+99.9+999.9+9999.9+99999.9的整数部分. (1)2.5×2.1×0.4×2 (2)1.25×0.25×32 (3)12.5×0.64×2.5 (4)0.5×0.8×0.4×0.125×25 (5)0.87×65.5+37.5×0.87-3×0.87 (6) 3.9×7.6+3.9×2.4+3.9 (7)6.2×1.11+2×6.2+6.2×6.89 (8)3.1×0.75+0.75×6.2+9.3×0.25 (9)8.63×2.3+7.7×5.21+3.42×7.7 (10)5.72×1.8+0.7×5.72-2.5×1.7 (11)3.6×9.99 (12)100.7×2.8 (12)1.98×30.2 (14)3.75×48+62.5×4.8 (15)2.01×67-1×0.67 (16)75×4.67+17.9×2.5 (17)1.01+1.04+1.07+...+3.98 (18) 0.14+0.3+0.5+...+19.7+19.9 (19)6.03+6.06+6.09+...+7.95 (20)0.2+0.4+0.6+0.22+0.24+...+0.96+0.98 (21)5.1×0.3+5.2×0.3+...+5.8×0.3+5.9×0.3 (22)1+14.25+27.25+40.25+...+2003.25 (23)求0.9+0.99+0.999+0.9999+0.99999的整数部分 本文来源:https://www.wddqw.com/doc/5c3ca4b9ad51f01dc281f1be.html