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2.87×〔6.3-2.3〕
=2.87×4.0
=11.48
54.7-45.3÷15
=54.7-3.02
=51.68
2.008×1999+2.008
=4013.992+2.008
=4016
10.8÷〖〔5.28-1.68〕×0.3〗0.5
=10.8÷（3.6×0.3）×0.5
=10.8÷1.08×0.5
=10×0.5
=5
3.69÷〔1.23×0.5〕
=3.69÷0.615
=6
=2.87×4.0
=11.48
54.7-45.3÷15
=54.7-3.02
=51.68
2.008×1999+2.008
=4013.992+2.008
=4016
10.8÷〖〔5.28-1.68〕×0.3〗0.5
=10.8÷（3.6×0.3）×0.5
=10.8÷1.08×0.5
=10×0.5
=5
3.69÷〔1.23×0.5〕
=3.69÷0.615
=6
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