68+12-70=
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24 . 25 + ( 4 . 6 ) . 37 + 24 . 38
24 . 25 + 24 . 37 + 24 . 38
24 . ( 25 + 37 + 38 )
24 . 100
2400
24 . 25 + 4 . 37 . 6 +24 . 38
= 24 . 25 + 24 . 37 + 24 . 38
= 24 . ( 25 + 38 + 37 )
= 24 . 100 = 2400
Phương pháp giải
- Tính giá trị của mỗi vế.
- So sánh các cặp số cùng hàng (cùng hàng chục hoặc cùng hàng đơn vị) theo thứ tự từ trái sang phải.
Lời giải chi tiết:
34 < 38 27 < 72 80 + 6 > 85
72 > 70 68 = 68 40 + 4 = 44
Among many subjects student learns in school, I math the most. This is one of the compulsory subjects from primary to high school ad even university. Math teaches learner about numbers and operation. Being good at math brings us several advantages. Doing math exercise improves one’s brain and its brainstorm. Moreover, people learning math can think more logically and make up one mind. There are many subjects we can apply mathemas to solve the problem: economics, engineering and even business. Math is said to originate from ancient Greece and develop completely as today. In VN it’s an increasing number of mathemaal genius such as Ngo Bao Chau. Therefore, Vietnamese are very proud of it. In my opinion, every student should be good at math or at least learn it. Since human gain lots of achievement related to math, specifically in modern society.
Tổng của 2 số đó là :
\(68+70=138\)
Đáp số : 138
\(A=1\cdot2+2\cdot3+...+68\cdot69+69\cdot70\)
\(3A=1\cdot2\cdot3+2\cdot3\cdot\left(4-1\right)+...+69\cdot70\cdot\left(71-68\right)\)
\(3A=1\cdot2\cdot3+2\cdot3\cdot4-1\cdot2\cdot3+...+69\cdot70\cdot71-68\cdot69\cdot70\)
\(3A=69\cdot70\cdot71\Rightarrow A=\dfrac{69\cdot70\cdot71}{3}=114310\)
68+12-70=0
k nha cac ban
68+12-70=10