7道简便计算、一道10分.( / ←此为分数线)1.1×2+2×3+3×4+……10×112.9999×2222+3333×33343.0.5×236×59/1194.238÷238又238/239 (带分数)5.125又1/20(带分数)÷416.6209/10013×10693/22869÷3337/106027.(1/2-1/3)+
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![7道简便计算、一道10分.( / ←此为分数线)1.1×2+2×3+3×4+……10×112.9999×2222+3333×33343.0.5×236×59/1194.238÷238又238/239 (带分数)5.125又1/20(带分数)÷416.6209/10013×10693/22869÷3337/106027.(1/2-1/3)+](/uploads/image/z/129813-69-3.jpg?t=7%E9%81%93%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%E3%80%81%E4%B8%80%E9%81%9310%E5%88%86.%EF%BC%88+%2F+%E2%86%90%E6%AD%A4%E4%B8%BA%E5%88%86%E6%95%B0%E7%BA%BF%EF%BC%891.1%C3%972%2B2%C3%973%2B3%C3%974%2B%E2%80%A6%E2%80%A610%C3%97112.9999%C3%972222%2B3333%C3%9733343.0.5%C3%97236%C3%9759%2F1194.238%C3%B7238%E5%8F%88238%2F239+%EF%BC%88%E5%B8%A6%E5%88%86%E6%95%B0%EF%BC%895.125%E5%8F%881%2F20%EF%BC%88%E5%B8%A6%E5%88%86%E6%95%B0%EF%BC%89%C3%B7416.6209%2F10013%C3%9710693%2F22869%C3%B73337%2F106027.%EF%BC%881%2F2-1%2F3%EF%BC%89%2B)
7道简便计算、一道10分.( / ←此为分数线)1.1×2+2×3+3×4+……10×112.9999×2222+3333×33343.0.5×236×59/1194.238÷238又238/239 (带分数)5.125又1/20(带分数)÷416.6209/10013×10693/22869÷3337/106027.(1/2-1/3)+
7道简便计算、一道10分.( / ←此为分数线)
1.1×2+2×3+3×4+……10×11
2.9999×2222+3333×3334
3.0.5×236×59/119
4.238÷238又238/239 (带分数)
5.125又1/20(带分数)÷41
6.6209/10013×10693/22869÷3337/10602
7.(1/2-1/3)+(1/4-1/5)+(1/7-1/10)+(1/14-1/15)+(1/28-1/30)
7道简便计算、一道10分.( / ←此为分数线)1.1×2+2×3+3×4+……10×112.9999×2222+3333×33343.0.5×236×59/1194.238÷238又238/239 (带分数)5.125又1/20(带分数)÷416.6209/10013×10693/22869÷3337/106027.(1/2-1/3)+
1.=2×(1+3)+4×(3+5)+6×(5+7)+8×(7+9)+10×(9+11)
=2×2×2+2×4×4+2×6×6+2×8×8+2×10×10
=2×(4+16+36+64+100)
=2×220=440
2.=3333×6666+3333×3334
=3333×(6666+3334)
=33330000
3.=0.5×2×118×59÷119
=58.50420168.【请检查题目】
4.将式子倒过来:238又238/239÷238=1又1/239=240/239
所以原式=239/240
5.=(123+2又1/20)÷41
=123÷41+41/20÷41
=3+1/20=3又1/20(或61/20)
6.=0.921173486【似乎没有简便算法,检查题目是否正确】
7.=(1/2+1/4)+(1/7+1/14+1/28)-1/3-1/5-1/15-1/30
=3/4+1/4-(10+6+2+1)/30
=11/30