七年级的计算题和答案100道

1)66x+17y=396725x+y=1200 答案：x=48y=47 (2)18x+23y=230374x-y=1998 答案：x=27y=79 (3)44x+90y=779644x+y=3476 答案：x=79y=48 (4)76x-66y=408230x-y=2940 答案：x=98y=51 (5)67x+54y=854671x-y=5680 答案：x=80y=59...