52.6*9.2+4.3*2.8
=51.6*9.2+9.2+4.3*2.8
=4.3*12*9.2+4.3*2.8+9.2
=4.3（12*9.2+2.8）+9.2
=4.3【9.2（10+2）+2.8】+9.2
=4.3（92+18.4+2.8）+9.2
=4.3*113.2+9.2
=113.2（4+0.3）+9.2
=452.8+33.96+9.2
=452.8+7.2+2+34-0.04
=462+34-0.04
=495.96
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