问题
解答题
求未知数x
6.5+2x=16.5
x:3=12:4.
答案
(1)6.5+2x=16.5,
6.5+2x-6.5=16.5-6.5,
2x=10,
2x÷2=10÷2,
x=5;
(2)x:3=12:4,
4x=3×12,
4x=36
4x÷4=36÷4,
x=9.
求未知数x
6.5+2x=16.5
x:3=12:4.
(1)6.5+2x=16.5,
6.5+2x-6.5=16.5-6.5,
2x=10,
2x÷2=10÷2,
x=5;
(2)x:3=12:4,
4x=3×12,
4x=36
4x÷4=36÷4,
x=9.