问题
解答题
解方程.
x-8.5=8.5
4.3x+1.8x=27.45
2x+28=56.
答案
(1)x-8.5=8.5,
x-8.5+8.5=8.5+8.5,
x=17;
(2)4.3x+1.8x=27.45,
6.1x=27.45,
6.1x÷6.1=27.45÷6.1,
x=4.5;
(3)2x+28=56,
2x+28-28=56-28,
2x÷2=28÷2,
x=14.
解方程.
x-8.5=8.5
4.3x+1.8x=27.45
2x+28=56.
(1)x-8.5=8.5,
x-8.5+8.5=8.5+8.5,
x=17;
(2)4.3x+1.8x=27.45,
6.1x=27.45,
6.1x÷6.1=27.45÷6.1,
x=4.5;
(3)2x+28=56,
2x+28-28=56-28,
2x÷2=28÷2,
x=14.