Новая Школа - онлайн-школа подготовки к ЕГЭ
Задача Задача №3731878
А
Аноним
15 октября 2026 12:44 · публичный вопрос
А
Аноним

Answers

Ответ нейросети

Краткие ответы

1. Simplify

a) \(5a-2b\)
b) \(10xy\)
c) \(b^2c^3\)

2. Write an expression

a) Lilly has \(\boxed{2x+7}\) dollars.
b) Each friend receives \(\boxed{\frac{t}{4}}\) cakes.

3.

a)
i) \(2p-4t+5\) — 3 terms
ii) \(0.6r\) — 1 term

b)
i) \(4b-2\) — expression
ii) \(8x=3\) — equation
iii) \(4A+W\) — expression

c) Like terms: \(\boxed{3t \text{ and } \frac12t}\)

d)
i) The coefficient of \(3x\) is \(\boxed{3}\).
ii) The coefficient of \(-2p\) is \(\boxed{-2}\).

4. Expand

a) \(\boxed{40r-30}\)
b) \(\boxed{12t-3}\)
c) \(\boxed{22f}\)
d) \(\boxed{14-19W}\)

5. Rectangles

Rectangle Area Perimeter
a \(\boxed{16p}\) \(\boxed{16p+4}\)
b \(\boxed{40x-10}\) \(\boxed{8x+18}\)

6. Simplify

a) \(\boxed{\frac{17m}{5}}\)
b) \(\boxed{\frac{11y}{20}}\)

Key steps

  • Like terms have the same letters with the same powers:
    \(2a+3a=5a\), but \(a\) and \(b\) cannot be combined.
  • In multiplication, multiply the numbers and collect identical letters:
    \(5x\cdot2y=10xy\), \(b\cdot b=b^2\).
  • “7 dollars more” means add \(7\); sharing equally means divide.
  • Terms are separated by \(+\) or \(-\). An equals sign makes an equation.
  • Use the distributive law: \[ k(a+b)=ka+kb. \] For example: \[ 2(5f-4t)+4(2t+3f) =10f-8t+8t+12f=22f. \]
  • For a rectangle: \[ S=ab,\qquad P=2(a+b). \]
  • To add fractions with variables, use a common denominator: \[ \frac{17y}{20}-\frac{3y}{10} =\frac{17y}{20}-\frac{6y}{20} =\frac{11y}{20}. \]

Проверка: в задании 4c слагаемые \(-8t\) и \(+8t\) сокращаются, поэтому остаётся только \(22f\).

Обсуждение

1 сообщение
А
Аноним

Answers