用递等式计算,能简算的要写出简算过程.42÷[14-(50-39)] 7.25×1.8+27.5×0.18905×99+905

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用递等式计算,能简算的要写出简算过程.
42÷[14-(50-39)] 7.25×1.8+27.5×0.18
905×99+905

42÷[14-(50-39)] 7.25×1.8+27.5×0.18
=42÷[14-11] =7.25×1.8+2.75×1.8
=42÷3 =1.8×(7.25+2.75)
=14 =1.8×10
=18