最佳答案:66x+17y=3967 25x+y=1200 答案:x=48 y=47 (2) 18x+23y=2303 74x-y=1998 答案:x=27 y=79 (3
最佳答案:0.4(x-0.2)+1.5=0.7x-0.38x=630x-10(10-x)=100x=54(x+2)=5(x-2)x=18120-4(x+5)=25x=18
最佳答案:5X-Y=120Y=5X-1203Y-11X=1203(5X-120)-11X=12015X-360-11X=1204X=480X=120Y=5X-120=60
最佳答案:(1) 66x+17y=396725x+y=1200答案:x=48 y=47(2) 18x+23y=230374x-y=1998答案:x=27 y=79(3)