问题
填空题
如果4a+3=7.8,则4a-3=______.
答案
4a+3=7.8,
4a+3-3=7.8-3,
4a÷4=4.8÷4,
a=1.2,
4×1.2-3,
=4.8-3,
=1.8,
故答案为:1.8.
如果4a+3=7.8,则4a-3=______.
4a+3=7.8,
4a+3-3=7.8-3,
4a÷4=4.8÷4,
a=1.2,
4×1.2-3,
=4.8-3,
=1.8,
故答案为:1.8.