计算 1.135+3.346+5.557+7.768+9.979=______．
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1.135+3.346+5.557+7.768+9.979，
=1.135+3.346+5.557+（5.557+2.211）+（5.557+4.422），
=1.135+3.346+5.557+5.557+2.211+5.557+4.422，
=（1.135+4.422）+（3.346+2.211）+5.557+5.557+5.557，
=5.557+5.557+5.557+5.557+5.557，
=5.557×5，
=27.785；
故答案为：27.785．
=1.135+3.346+5.557+（5.557+2.211）+（5.557+4.422），
=1.135+3.346+5.557+5.557+2.211+5.557+4.422，
=（1.135+4.422）+（3.346+2.211）+5.557+5.557+5.557，
=5.557+5.557+5.557+5.557+5.557，
=5.557×5，
=27.785；
故答案为：27.785．
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