7.2×4.5×2.8×4.5=（7.8+2.8）×4.5
×
×
．（判斷對(duì)錯(cuò)）
分析：7.2×4.5×2.8×4.5 是一個(gè)連乘算式，不適用于乘法分配律．
解答：解：由于（7.2+2.8）×4.5=7.2×4.5+2.8×4.5，
所以7.2×4.5×2.8×4.5=（7.2+2.8）×4.5是錯(cuò)誤．
故答案為：×．
點(diǎn)評(píng)：在利用運(yùn)算定律計(jì)算時(shí)，要注意分析題目中的數(shù)據(jù)及運(yùn)算符號(hào)是否適用．
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