①19-120%X=7 ②(1-25%)X=36 ③3/4X-50%X=17.5 ④5X+1.5=10X=ai ke si
问题描述:
①19-120%X=7 ②(1-25%)X=36 ③3/4X-50%X=17.5 ④5X+1.5=10
X=ai ke si
答
(1)移向,19-7=120%x,12=1.2x,解得x=10,(2)75%x=36,0.75x=36,解得x=48(3)先通分,3/4x-2/4x=17.5,解得x=70,(4)5x=8.5,解得x=1.7