12.9除0.72加43.5除3.6和5.25除13.125除4乘85.2和0.125除(3.6除80)乘0.18简便计算

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12.9除0.72加43.5除3.6和5.25除13.125除4乘85.2和0.125除(3.6除80)乘0.18简便计算12.9除0.72加43.5除3.6和5.25除13.125除4乘85.2和0

12.9除0.72加43.5除3.6和5.25除13.125除4乘85.2和0.125除(3.6除80)乘0.18简便计算
12.9除0.72加43.5除3.6和5.25除13.125除4乘85.2和0.125除(3.6除80)乘0.18简便计算

12.9除0.72加43.5除3.6和5.25除13.125除4乘85.2和0.125除(3.6除80)乘0.18简便计算
=1290/72+435/36
=645/36+435/36
=(645+435)/36
=1080/36
=30
=(21/4)÷(105/8)÷(4×85.2)
=(2/5)÷(4×85.2)
=1/(5×2×85.2)
=1/852
=1/8÷(3.6÷80)×0.18
=(80×0.18)/(8×3.6)
=(10×0.18)/3.6
=1.8/3.6
=0.5