x+(x+5)+(x+10)+(x+15)+(x+20)+(x+25)+(x+30)+(x+35)+(x+40) = 288
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\(\left(27.700-45.20\right)\div\left(45-40+35-30+25-20+15-10+5\right)\)
\(=\)\(\left(27.100-45.20\right)\div25\)
\(=\)\(\left(27.35.20-45.20\right)\div25\)
\(=\)\(\left[\left(27.35-45\right).20\right]\div25\)
\(=\)\(18000\div25\)
\(=\)\(750\)
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\(\dfrac{x-55}{45}+\dfrac{x-30}{35}+\dfrac{x-25}{25}+\dfrac{x-40}{15}=10\)
\(< =>\dfrac{x-55}{45}+\dfrac{x-30}{35}+\dfrac{x-25}{25}+\dfrac{x-40}{15}-10=0\)
\(< =>\dfrac{x-55}{45}-1+\dfrac{x-30}{35}-2+\dfrac{x-25}{25}-3+\dfrac{x-40}{15}-4=0\)
\(< =>\dfrac{x-100}{45}+\dfrac{x-100}{35}+\dfrac{x-100}{25}+\dfrac{x-100}{15}=0\)
\(< =>\left(x-100\right)\left(\dfrac{1}{45}+\dfrac{1}{35}+\dfrac{1}{25}+\dfrac{1}{15}\right)=0\)
\(< =>x-100=0\left(\dfrac{1}{45}+\dfrac{1}{35}+\dfrac{1}{25}+\dfrac{1}{15}\ne0\right)\)
\(< =>x=100\)
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=\(\frac{25X\left(47+16+37\right)}{5+5+5+5+5}\)
=\(\frac{25X100}{25}\)
=100 ( cùng chia tử và mẫu cho 100) nhớ l i k e
25 x 47 + 16 x25 + 25 x 37 = cũng rất khó mình học lớp 6 mà ko giải
được
45 - 40 + 35 - 30 + 25 - 20 + 15 - 10 +5
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2x-15=25
2x=25+15
2x=40
x=40:2
x=20
x-8=96
x=96+8
x=104
120-(x-3)=35
x-3=120-35
x-3=85
x=85+3
x=88
35-5(x-2)=15
5(x-2)=35-15
5(x-2)=20
x-2=20:5
x-2=4
x=4+2
x=6
(x-9)-20=19
x-9=19+20
x-9=39
x=39+9
x=48
782:(216-x-3)=15
hik như câu này đề lỗi
130-30(x-2)=10
30(x-2)=130-10
30(x-2)=120
x-2=120:30
x-2=4
x=4+2
x=6
chúc bạn học tốt nha
ủng hộ mk bằng cách tk nha
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1: =-2/9(15/17+2/17)=-2/9
2: \(=\dfrac{-6}{3}+\dfrac{-21}{90}\)
=-2-7/30=-67/30
3: \(=\dfrac{3}{4}\cdot\dfrac{7}{5}+\dfrac{9}{7}\cdot\dfrac{3}{2}\)
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
1: =-2/9(15/17+2/17)=-2/9
2: =−63+−2190=−63+−2190
=-2-7/30=-67/30
3: =34⋅75+97⋅32=34⋅75+97⋅32
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
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( 5 + 10 + 15 + 20 + 25 + 30 + 35 ) x ( 42 - 6 x 7 )
= ( 5 + 10 + 15 + 20 + 25 + 30 + 35 ) x ( 42 - 42 )
= ( 5 + 10 + 15 + 20 + 25 + 30 + 35 ) x 0
= 0
\(x+\left(x+5\right)+\left(x+10\right)+\left(x+15\right)+\left(x+20\right)+...+\left(x+40\right)=288\\ \left(x+x+x+x+x+...+x\right)+\left(5+10+15+20+...+40\right)=288\\ 9\times x+180=288\\ 9\times x=108\\ x=108:9=12\)