depends on the teachers. If your english teach makes you do a lot of written work in class (such as mine (dang FCAT)), and enforce grammar and spelling, language will not be "lost", though if the teachers don't, it is quite likely. Same goes for math: if the teacher makes you work without a calculator (again, my Algebra II teacher), you will develop mathematical skills, if not, you won't.

Of course, there are those (again, me) who would make themselves learn to do this all anyway, and there are others who wouldn't no matter what.

In truth, it depends on your attitude and your teachers. Support learning and independence from machines, and you will have it; don't, and you won't.

SIDENOTES:
Computers have actually made language even more difficult, as now there are many more common terms children have to know in order to get along in this world.

Computers have also advanced mathematics in many ways. There likely would not even be a mathematical structure called a function if computers had not come around.