列式计算:*N/z4O/_9y;P
(1)27.8减去19.3的差.再加上24.5,和是多少?*N/z4O/_9y;P
算式:提示+b7q-|,f:^'U:U+C/A5`5M*N/z4O/_9y;P
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(2)23.64加18.9的和.再乘以2.5得多少?*N/z4O/_9y;P
算式:提示:y3a2q6B)J(|:I8B8b1`;R0h*N/z4O/_9y;P
,c7v;X5z'a/n*Y1g*N/z4O/_9y;P