利用简便方法计算.3.74×2.85+8.15×3.74-3.74;99.99×0.8+11.11×2.8;31.4×0.68+314×0.032;3.46×
答案:1 悬赏:60 手机版
解决时间 2021-02-14 21:24
- 提问者网友:萌卜娃娃
- 2021-02-14 16:19
利用简便方法计算.3.74×2.85+8.15×3.74-3.74;99.99×0.8+11.11×2.8;31.4×0.68+314×0.032;3.46×
最佳答案
- 五星知识达人网友:雾月
- 2021-02-14 17:17
(1)3.74×2.85+8.15×3.74-3.74 =3.74×(2.85+8.15-1) =3.74×10 =37.4; (2)99.99×0.8+11.11×2.8 =11.11×7.2+11.11×2.8 =11.11×(7.2+2.8) =11.11×10 =111.1; (3)31.4×0.68+314×0.032 =314×0.068+314×0.032 =314×(0.068+0.032) =314×0.1 =31.4; (4)3.46×(2.8-1.3)+1.5×1.54 =3.46×1.5+1.5×1.54 =(3.46+1.54)×1.5 =5×1.5 =7.5; (5)22.8×98+45.6 =22.8×98+22.8×2 =22.8×(98+2) =22.8×100 =2280; (6)999.9×0.28+0.6666×80 =3333×0.084+3333×0.016 =3333×(0.084+0.016) =3333×0.1 =333.3; (7)5.2×11111+66666×0.8 =5.2×11111+11111×4.8 =(5.2+4.8)×11111 =10×11111 =111110; (8)20.05×39+200.5×4.1+40×10.025 =200.5×3.9+200.5×4.1+40×10.025 =(3.9+4.1)×200.5+40×10.025 =8×200.5+40×10.025 =8×200.5+2×200.5 =(8+2)×200.5 =10×200.5 =2005. |
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