This book is different from that one

This book is different from that one

This book is different from that one

Reading is not only fun but also a lot of knowledge?

Reading is both interesting and instructive.

Watching movies must be more interesting than reading books

watching movie is more interesting than reading books

It is known that the mass of an R atom is 2.657 * 10 to the - 26th power kg, so how many grams of R2 is 1mol?

6.02 * 10 ＾ 23 R2 are 1 mole, so the mass of 1 mole R2 is:
2＊2.657＊10＾－26＊6.02＊10＾23＝0.032kg=32g
The amount of 32 g R2 is 1 mol

A and B leave each other from a and B and meet at 4km away from the midpoint. It is known that the speed of a is five ninth of that of B. how many km is the distance between a and B

Route a: route B = 5 / 9:1 = 5:9
The distance between the two places = 4 × 2 ÷ (9-5) × (9 + 5) = 28 km

Finding the area of isosceles triangle by Pythagorean theorem
It is known that the height of two triangles AB is 5cm. The length is 6cm. How to find the area. Pythagorean theorem. Thank you. The area of isosceles triangle ABC is required

1. The bottom should be 6cm
∵b^2=c^2-a^2=5^2-3^2=25-9=16,b>0
∴b=4
∴S=4×6/2=12 cm^2

Given that ABC is an integer, and a + B = 70, C-B = 44, a-c = 90, what is the square of the sum of ABC

a=102 b=-32 c=12 （a+b+c）^2=82^2=6724

The bus and the minibus are facing each other from 360 kilometers away. The bus runs 60 kilometers per hour, and the minibus runs 1.5 hours later than the bus. As a result, the two cars finish the whole journey at the same time and arrive at a certain place

Let the speed of the car be χ
360÷χ=360÷60-1.5
χ=80

Use a piece of paper with a circumference of 16 decimeters to cut the largest circle. What is the area of the remaining part in square decimeters?

(16 ／ 4) & # 178; - 3.14 × (16 ／ 4 ／ 2) & # 178; = 3.44 (square decimeter)

If the difference between the monomial 3A ^ x + 5 B ^ x + y and the monomial - 5A ^ y B ^ 2-x is a monomial, then x =, y=

If the difference between two monomials is still a monomial, the two monomials must be of the same kind
So x + 5 = y
x+y=2--x
Sort it out: X -- y = -- 5 (1)
2x+y=2 (2)
(1) + (2) get: 3x = -- 3
x=--1
Substituting x = -- 1 into (2) gives: - 2 + y = 2
y=4.