1/7+1/14+1/28+1/56 简便计算

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1/7+1/14+1/28+1/56简便计算1/7+1/14+1/28+1/56简便计算1/7+1/14+1/28+1/56简便计算1/7+1/14+1/28+1/56=1/7+(1/7-1/14)+

1/7+1/14+1/28+1/56 简便计算
1/7+1/14+1/28+1/56 简便计算

1/7+1/14+1/28+1/56 简便计算
1/7+1/14+1/28+1/56
=1/7+(1/7-1/14)+(1/14-1/28)+(1/28-1/56)
=2/7-1/56
=15/56

1/7+1/14+1/28+1/56
=1/7×(1+1/2+1/4+1/8)
=1/7×(2-1/8)
=1/7×15/8
=15/56

=8/56+4/56+2/56+1/56=15/56

1/7+1/14+1/28+1/56
=(1/7+1/14+1/28+1/56)56/56
=(8+4+2+1)/56
=15/56

8/56+4/56+2/56+1/56=15/56