HOC24
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Chủ đề / Chương
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\(-115-\left(17+2x\right)=20\)
\(=>17+2x=\left(-115\right)-20\)
\(=>17+2x=-135\)
\(=>2x=\left(-135\right)-17\)
\(=>2x=-152\)
\(=>x=\left(-152\right):2\)
\(=>x=-76\)
a) \(16,7\times2,5-6,7\times2,5\)
\(=2,5\times\left(16,7-6,7\right)\)
\(=2,5\times10=25\)
b) \(4,65\times5,7+5,7\times5,35\)
\(=5,7\times\left(4,65+5,35\right)\)
\(=5,7\times10=57\)
\(#NgHahh\)
Giáo dục địa phương - Kon Tum. ( Vì mình không thấy môn học này nên mình chọn môn học có liên quan )
Giúp mình với nha. Thanks
Ta có:
\(10=2.5\)
\(1000=2^3.5^3\)
\(ƯCLN\left(10;1000\right)=2.5=10\)
\(ƯC\left(10;1000\right)=Ư\left(10\right)=\left\{1;2;5;10\right\}\)
Vì \(ƯC\in Z\) nên \(ƯC\in\left\{2;5\right\}\)
1+2+3+4+5+...+15+16+17+18+19+20
= ( 1 + 19 ) + ( 2 + 18 ) + ( 3 + 17 ) + ( 4 + 16 ) + ( 5 + 15 ) + ... + ( 9 + 11 ) + ( 10 + 20 )
= 20 + 20 + 20 + 20 + ... + 20 + 30
= 180 + 30 = 210
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