(1)Aの体重-Cの体重
-1.7-(-3.1)=1.4
AはCよりも1.4kg重い
(2)(Aの体重+Bの体重+Cの体重･･･Eの体重)÷5=44.8
(x-1.7+x+2.6+x-3.1+x-0.4+x+1.6)÷5=44.8
(5x-1)÷5=44.8
x-0.2=44.8
x =45.0
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