题目解方程. 0.7x=0.91 x-5.2=1.08 x÷12=150 6.27+x=9. 答案解:(1)0.7x=0.91, 0.7x÷0.7=0.91÷0.7, x=1.3;(2)x-5.2=1.08, x-5.2+5.2=1.08+5.2, x=6.28;(3)x÷12=150, x÷12×12=150×12, x=1800;(4)6.27+x=9,6.27+x-6.27=9-6.27, x=2.73....