7.08+5.4+0.92x（4+0.4）x0.25
=7.08+5.4+0.92x4x1.1x0.25
=12.48+0.92x11
=12.48+1.012
=13.492
7.08+5.4+0.92×（4+0.4）×0.25
=12.48+0.92×（4×0.25+0.4×0.25）
=12.48+0.92×1.1
=12.48+0.92×1+0.92×0.1
=12.48+0.92+0.092
=13.4+0.092
=13.492
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