X+15 :40=44:32 (X-300):5=640:8 1.7:(X-7)=6.8:92 解比例
问题描述:
X+15 :40=44:32 (X-300):5=640:8 1.7:(X-7)=6.8:92 解比例
答
X+15 :40=44:32
x+15=40*44÷32=55
x=40;
(X-300):5=640:8
x-300=640*5÷8=400
x=700
1.7:(X-7)=6.8:92
x-7=92*1.7÷6.8=23
x=30