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5 - 10 + 15 - 20 + 25 - 30 + 35 - 40 + 45
= 45 - 40 + 35 - 30 + 25 - 20 + 15 - 10 + 5
= (45 - 40) + (35 - 30) + (25 - 20) + (15 - 10) + 5
= 5 + 5 + 5 + 5 + 5
= 25
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
45x6=270
1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9+9
=(1x2)+(2x2)+(3x2)+(4x2)+(5x2)+(6x2)+(7x2)+(8x2)+(9x2)
=2+4+6+8+10+12+14+16+18
=6+6+8+10+12+14+16+18
=12+8+10+12+14+16+18
=20+10+12+14+16+18
=30+12+14+16+18
=42+14+16+18
=56+16+18
=72+18
=90
78:5=15(dư3)
45:5=9
x:5=25
x= 25x5
x= 125
tk nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,x+1=35:7+5\)
\(\Leftrightarrow x+1=10\)
\(\Leftrightarrow x=9\)
\(b,x:3=45:5\)
\(\Leftrightarrow x:3=9\)
\(\Leftrightarrow x=27\)
hok tốt!
a) \(x+1=35:7+5\)
\(\Rightarrow x+1=5+5\)
\(\Rightarrow x+1=10\)
\(\Rightarrow x=10-1\)
\(\Rightarrow x=9\)
Vậy x = 9
b) \(x:3=45:5\)
\(\Rightarrow x:3=9\)
\(\Rightarrow x=9\times3\)
\(\Rightarrow x=27\)
Vậy x = 27
_Chúc bạn học tốt_
![](https://rs.olm.vn/images/avt/0.png?1311)
= 339,5
= 43