10道小学奥数题目(能简便的就简便) (要有算式 不要只有答案)①:1613+270÷18×25 ②207×39-1898÷26 ③20.7-0.08×(10.06-0.4) ④(1.01-0.09)×0.001⑤9.9×12.7+12.7×0.1 ⑥0.875-(1/4+3/8)⑦4又1/5 - 2又3/
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/16 08:34:38
10道小学奥数题目(能简便的就简便) (要有算式 不要只有答案)①:1613+270÷18×25 ②207×39-1898÷26 ③20.7-0.08×(10.06-0.4) ④(1.01-0.09)×0.001⑤9.9×12.7+12.7×0.1 ⑥0.875-(1/4+3/8)⑦4又1/5 - 2又3/
10道小学奥数题目(能简便的就简便) (要有算式 不要只有答案)
①:1613+270÷18×25 ②207×39-1898÷26
③20.7-0.08×(10.06-0.4) ④(1.01-0.09)×0.001
⑤9.9×12.7+12.7×0.1 ⑥0.875-(1/4+3/8)
⑦4又1/5 - 2又3/4 + 5/12 ⑧3 ÷ 3/4 - 3/4 ÷ 3 + 3/4 × 3
⑨( 3/4 - 3/4 × 2/5 ) ÷ 1/5 ⑩5/7 ÷ 12 + 2/7 ×1/12
答的好的 记着要 (要简便)(要算式不能只有答案)
会的来 我急用 最迟明天
10道小学奥数题目(能简便的就简便) (要有算式 不要只有答案)①:1613+270÷18×25 ②207×39-1898÷26 ③20.7-0.08×(10.06-0.4) ④(1.01-0.09)×0.001⑤9.9×12.7+12.7×0.1 ⑥0.875-(1/4+3/8)⑦4又1/5 - 2又3/
解答:
①:1613+270÷18×25 = 1613+270÷9÷2×25 =1613+375=1988
② 207×39-1898÷26 = (200+7)×39-73 = 7800+273-73=8000
③20.7-0.08×(10.06-0.4)=20.7-0.08×(10+0.06)+0.08×0.4=19.8718
④(1.01-0.09)×0.001 =(1+0.01-0.09)×0.001=0.001-0.00008=0.00092
⑤9.9×12.7+12.7×0.1=(10-0.1)×12.7+12.7×0.1=127
⑥0.875-(1/4+3/8)=0.875-0.75=0.125
⑦4又1/5 - 2又3/4 + 5/12=21/5-11/4+5/12=21/5-28/12=9又1/3
⑧3 ÷ 3/4 - 3/4 ÷ 3 + 3/4 × 3 =3×4/3-1/4+9/4=4+2=6
⑨( 3/4 - 3/4 × 2/5 ) ÷ 1/5=3/4×(1-2/5)×5=9/4
⑩5/7 ÷ 12 + 2/7 ×1/12 =5/7 ×1/12+2/7 ×1/12=(5/7+2/7)×1/12=12×1/12=1
6214.6504216046.506.652
①:1613+270÷18×25 = 1613+270÷9÷2×25 =1613+375=1988
② 207×39-1898÷26 = (200+7)×39-73 = 7800+273-73=8000
③20.7-0.08×(10.06-0.4)=20.7-0.08×(10+0.06)+0.08×0.4=19.8718
④(1.01-0.09)×0.001 =(1+...
全部展开
①:1613+270÷18×25 = 1613+270÷9÷2×25 =1613+375=1988
② 207×39-1898÷26 = (200+7)×39-73 = 7800+273-73=8000
③20.7-0.08×(10.06-0.4)=20.7-0.08×(10+0.06)+0.08×0.4=19.8718
④(1.01-0.09)×0.001 =(1+0.01-0.09)×0.001=0.001-0.00008=0.00092
⑤9.9×12.7+12.7×0.1=(10-0.1)×12.7+12.7×0.1=127
⑥0.875-(1/4+3/8)=0.875-0.75=0.125
⑦4又1/5 - 2又3/4 + 5/12=21/5-11/4+5/12=21/5-28/12=9又1/3
⑧3 ÷ 3/4 - 3/4 ÷ 3 + 3/4 × 3 =3×4/3-1/4+9/4=4+2=6
⑨( 3/4 - 3/4 × 2/5 ) ÷ 1/5=3/4×(1-2/5)×5=9/4
⑩5/7 ÷ 12 + 2/7 ×1/12 =5/7 ×1/12+2/7 ×1/12=(5/7+2/7)×1/12=12×1/12=1
收起