问题
解答题
解下列方程.
5×0.7+3x=6.2
0.5(x-0.7x)=6.3
3x+1.7x=7.52
15(x+3)=141.
答案
(1)5×0.7+3x=6.2,
3.5+3x=6.2,
3x=6.2-3.5,
x=2.7÷3,
x=0.9;
(2)0.5(x-0.7x)=6.3
x-0.7x=6.3×2,
0.3x=12.6,
x=12.6÷0.3,
x=42;
(3)3x+1.7x=7.52,
4.7x=7.52,
x=7.52÷4.7,
x=1.6;
(4)15(x+3)=141,
x+3=141÷15,
x=9.4-3,
x=6.4.