之加上243分之二等于多少用简便算法
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3分之2加9分之2加27分之2加81分之2加243分之2 简便运算怎么写啊
给算式中先借一个1/243,再从算式中减去,然后从后向计算,即:
2/3+2/9+2/27+2/81+2/243
=2/3+2/9+2/27+2/81+2/243+1/243-1/243
=2/3+2/9+2/27+2/81+(2/243+1/243)-1/243
=2/3+2/9+2/27+(2/81+1/81)-1/243
=2/3+2/9+(2/27+1/27)-1/243
=2/3+(2/9+1/9)-1/243
=2/3+1/3-1/243
=1-1/243
=242/243
给算式中先借一个1/243,再从算式中减去,然后从后向计算,即:
2/3+2/9+2/27+2/81+2/243
=2/3+2/9+2/27+2/81+2/243+1/243-1/243
=2/3+2/9+2/27+2/81+(2/243+1/243)-1/243
=2/3+2/9+2/27+(2/81+1/81)-1/243
=2/3+2/9+(2/27+1/27)-1/243
=2/3+(2/9+1/9)-1/243
=2/3+1/3-1/243
=1-1/243
=242/243
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