问题
解答题
解方程.
8x+4x=1200.56×5-4x=0.44(x-0.5)=9.6.
答案
(1)8x+4x=120,
12x=120,
12x÷12=120÷12,
x=10;
(2)0.56×5-4x=0.4,
2.8-4x=0.4,
2.8-4x+4x=0.4+4x,
0.4+4x=2.8,
0.4+4x-0.4=2.8-0.4,
4x=2.4,
4x÷4=2.4÷4,
x=0.6;
(3)4(x-0.5)=9.6,
4x-2=9.6,
4x-2+2=9.6+2,
4x=11.6,
4x÷4=11.6÷4,
x=2.9.