7.58+6.5+4.42=6.5+(7.58+4.42)
正確
分析:根據(jù)題意,由加法交換律和結(jié)合律進(jìn)行解答即可.
解答:
7.58+6.5+4.42,
=6.5+(7.58+4.42),
=6.5+12,
=18.5.
故答案為:正確.
點(diǎn)評(píng):考查了加法交換律和結(jié)合律的運(yùn)用,然后再進(jìn)一步解答即可.
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