(1)两车同时开出,向背而行,x小时后两车相距720千米,则列方程为;60x+100x=720-480
(2)慢车先开出1小时,相向而行,慢车开出x小时后量车相距20千米,求x的值
(x+1)60+100x=480-20
解;60x+60+100x=460
60+160x=460
160x=460-60
160x=400
x=2.5
(1)两车同时开出,向背而行,x小时后两车相距720千米,则列方程为;60x+100x=720-480
(2)慢车先开出1小时,相向而行,慢车开出x小时后量车相距20千米,求x的值
(x+1)60+100x=480-20
解;60x+60+100x=460
60+160x=460
160x=460-60
160x=400
x=2.5