问题
解答题
解方程
①x÷1.8=10.5
②6x-0.9=4.5
③7.3x+5.6x=5.16.
答案
①x÷1.8=10.5,
x÷1.8×1.8=10.5×1.8,
x=18.9;
②6x-0.9=4.5,
6x-0.9+0.9=4.5+0.9,
6x=5.4,
6x÷6=5.4÷6,
x=0.9;
③7.3x+5.6x=5.16,
(7.3+5.6)x=5.16,
12.9x=5.16,
12.9x÷12.9=5.16÷12.9,
x=0.4.