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\(1,2\times15+1,2\times74+1,2\\ =1,2\times\left(15+74+1\right)\\ =12\times100\\ =1200\)

1,2×(15+74+1)

1,2×90

108

`#3107.101107`

\(254\cdot37+37\cdot22+276\cdot63\\ =37\cdot\left(254+22\right)+276\cdot63\\ =37\cdot276+276\cdot63\\ =276\cdot\left(37+63\right)\\ =276\cdot100\\ =27600\)

\(254\cdot37+37\cdot22+276\cdot63\)

\(=37\left(254+22\right)+276\cdot63\)

\(=276\left(63+37\right)=276\cdot100=27600\)

Sửa đề: 62,73:8,4+21,27:8,4

=(62,73+21,27):8,4

=84:84=10

1. If he finishes his work early,......he will have more time to play with his friends..

2. You will fail the exam if......you don't study harder...

3. I would go there if......I had money......

4. If he works hard,...he will pass the exam.........

5. Tomorrow if I meet him,.....I will give him the letter....

6. If I could speak Chinese,..I would study there.......

7. If you were in my position,......you would understand me..

8. She will visit you if....she has time....

9. If her father doesn't work in the company,...he will work in the garden....

10. He would write to you if...he finished work early......

a: \(2\cdot3\cdot6\cdot6\cdot6=6\cdot6\cdot6\cdot6=6^4\)

b: \(4\cdot4\cdot5\cdot5\cdot5=4^2\cdot5^3\)

\(a,2.3.6.6.6\)

\(=6.6.6.6\)

\(=6^4\)

\(b,4.4.5.5.5\)

\(=4^2.5^3\)

\(64=8^2;100=10^2\)

\(121=11^2\)

\(169=13^2\)

\(196=14^2\)

\(289=17^2\)

64=8²

100=10²

121= 11²

169=14²

289=17²

6,2x+3,1x=4,65

=>9,3x=4,65

=>x=4,65:9,3=0,5

6,2x+3,1x=4,65

x.(6,2+3,1)=4,65

9,3.x=4,65

x=4,65:93

x=0,5

\(12,3-2\left(x+1,3\right)=5,7\)

\(2\left(x+1,3\right)=12,3-5,7\)

\(2\left(x+1,3\right)=6,6\)

\(x+1,3=6,6:2\)

\(x+1,3=3,3\)

\(x=3,3-1,3\)

\(x=2\)

`12,3 - 2× (x + 1,3) = 5,7`

`2× (x + 1,3) = 12,3 - 5,7`

`2× (x + 1,3) = 6,6`

`x + 1,3 = 6,6 : 2`

`x + 1,3 = 3,3`

`x = 3,3 - 1,3`

`x = 2`

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