☰ Contents · Algebra

Rules for removing brackets. Chapter I review

Lessons 6–7 · 2 lessons · Sh.A. Alimov, O.R. Xolmuhamedov, M.A. Mirzaahmedov. Algebra, Grade 7, revised and expanded 5th edition. O‘qituvchi NMIU, Tashkent, 2017
Answers are for parents and teachers.
1
Compute 120 - (45 - 15 + 20).
2
Simplify 7a - (3a + 2b) + (b - a).
3
Simplify 4(x - 2) - 3(2x - 5) and find its value at x = -1.
4
One side of a triangle is a cm, the second is 3 cm longer than the first, and the third is 2 cm shorter than the second. Write its perimeter as an expression and simplify.
5
Enclose c and d in brackets with a plus before them in a - b + c - d.