请问这条数学题如何计算(6.25-1又8/9)/(7/12*1又1/5)还有一条:95.6*8+0.4*0.1258谢谢

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请问这条数学题如何计算(6.25-1又8/9)/(7/12*1又1/5)还有一条:95.6*8+0.4*0.1258谢谢
请问这条数学题如何计算
(6.25-1又8/9)/(7/12*1又1/5)
还有一条:95.6*8+0.4*0.1258谢谢

请问这条数学题如何计算(6.25-1又8/9)/(7/12*1又1/5)还有一条:95.6*8+0.4*0.1258谢谢
1、
(6.25-1又8/9)/(7/12*1又1/5)
=(625/100-17/9)÷(7/12 × 6/5)
=(25/4-17/9)÷7/10
=(225/36-68/36)÷7/10
=157/36 × 10/7
=785/126
=6又29/126
2、
95.6*8+0.4*0.1258
=764.8+0.05032
=764.85032

( 6.25-1又8/9)/(7/12*1又1/5) 6.25=25/4, 1又8/9=17/9, 1又1/5=6/5
=(25/4-17/9)/(7/12*6/5) 然后通分
=(225/36-68/36) / (7/10)
=(157/36 ) / (7/10)
=785/126=6.2301587
95.6*8+0.4*0.1258=764.8+0.05032=764.85032

(6.25-1又8/9)/(7/12*1又1/5)=6.23016