0.3+0.7×0.8=1×0.8=0.8
×
×
．（判斷對(duì)錯(cuò)）
分析：根據(jù)題意，0.3+0.7×0.8先算乘法，再算減法，計(jì)算出結(jié)果，然后再進(jìn)一步解答．
解答：解：
0.3+0.7×0.8，
=0.3+0.56，
=0.86；
0.86≠0.8；
所以，0.3+0.7×0.8=1×0.8=0.8是錯(cuò)誤的．
故答案為：×．
點(diǎn)評(píng)：既有加法，又有乘法的算式，要先算乘法，再算加法．
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