解比例:(x-300):5=640:8 1.7:(x-7)=6.8:92 40分之x+15=32分之44

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解比例:(x-300):5=640:8 1.7:(x-7)=6.8:92 40分之x+15=32分之44
解比例:(x-300):5=640:8 1.7:(x-7)=6.8:92 40分之x+15=32分之44

解比例:(x-300):5=640:8 1.7:(x-7)=6.8:92 40分之x+15=32分之44
(x-300):5=640:8 1.7:(x-7)=6.8:92
(x-300):5=80:1 1:(x-7)= 4:92
400=x-300(内项乘积等于外项乘积) 4(x-7)=92
x=700 x=30
(x+15)/40 +15=44/32=11/8
(x+15)/40 =11/8-15
(x+15)/40 =-109/8
x+15=-109/8 ×40=-545
x=-560