2.75 x 8+27.5 x 0.8 = 2.75 x 8+2.75 x 8 = 2 x 2.75 x 8 = 5.5 x 8 = 44
注：加号两边是一样的，只是小数位置不同
2.75×8+27.5×0.8
=2.75×8+2.75x10x0.8
=2.75×8+2.75x8
=2.75×8×2 -------------------- (2.75=2+0.75) ，0.75=3/4 ）
=（2+0.75）x16
=2x16+3/4x16
=32+12
=44
2.75✖️8+27.5✖️0.8
=2.75✘(8+10✘0.8)
=2.75✘16
=2.75✘10+2.75✘6
=27.5+16.5
=44
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