计算 1.135+3.346+5.557+7.768+9.979=_.
问题描述:
计算 1.135+3.346+5.557+7.768+9.979=______.
答
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....