问题
填空题
如果4x+5=12.2,那么25.8-8x=______.
答案
4x+5=12.2,
4x+5-5=12.2-5,
4x=7.2,
4x÷4=7.2÷4,
x=1.8,
25.8-8×1.8,
=25.8-14.4,
=11.4.
故答案为:11.4.
如果4x+5=12.2,那么25.8-8x=______.
4x+5=12.2,
4x+5-5=12.2-5,
4x=7.2,
4x÷4=7.2÷4,
x=1.8,
25.8-8×1.8,
=25.8-14.4,
=11.4.
故答案为:11.4.