问题
解答题
解方程.
6.5×8+5x=79
3(x+2.1)=10.5
x-0.36x=16.
答案
(1)6.5×8+5x=79
52+5x=79
52+5x-52=79-52
5x=27
5x÷5=27÷5
x=2.4;
(2)3(x+2.1)=10.5
3(x+2.1)÷3=10.5÷3
x+2.1=3.5
x+2.1-2.1=3.5-2.1
x=1.4;
(3)x-0.36x=16
0.64x=16
0.64x÷0.64=16÷0.64
x=25.