递等式计算怎么算！
=58.16+10.62-29.38=68.78-29.38=39.4
=3.52*（1-0.9）=3.52*0.1=0.352
=1.8*（10-0.1）=18-0.18=17.82
=2.5*0.4*0.8*12.5=1*（0.8*12.5）=10
58.16-29.38+10.62
=58.16+10.62-29.38
=68.98-29.38
=39.6
3.52-3.52×0.9
=3.52×1-3.52×0.9
=3.52×(1-0.9)
=3.52×0.1
=0.352
1.8×9.9
=1.8×(10-0.1)
=1.8×10-1.8×0.1
=18-0.18
=17.82
2.5×0.32×12.5
=2.5× (0.4×0.8)×12.5
=(2.5×0.4)×(0.8×12.5)
=1×10
=10
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