7.1+0.9×（0.9-0.75）
分析：根據(jù)四則混合運(yùn)算的運(yùn)算順序計(jì)算即可．
解答：解：7.1+0.9×（0.9-0.75）
=7.1+0.9×0.15
=7.1+0.135
=7.235．
點(diǎn)評：兩級運(yùn)算先算乘除后算加減，有括號的先計(jì)算括號內(nèi)部的．
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