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\(\frac{1919}{2323}.\frac{4646}{7474}.\frac{37}{19}\)
\(=\frac{19}{23}.\frac{23}{37}.\frac{37}{19}\)
\(=\frac{19.23.37}{23.37.19}\)
\(=1\)
_Chúc bạn học tốt_
ta có:
\(\frac{1919}{2323}=\frac{19}{23}\)
\(\frac{4646}{7474}=\frac{46}{74}\)
=> \(\frac{1919}{2323}\cdot\frac{4646}{7474}.\frac{37}{19}=\frac{19}{23}\cdot\frac{46}{74}\cdot\frac{37}{19}\)= \(\frac{19}{23}\cdot\frac{2\cdot23}{37\cdot2}\cdot\frac{37}{19}\)= 1
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37 x 25 + 37 x 35 + 37x 39 + 37
= 37x ( 25+ 35+ 39 + 1)
= 37 x 100
= 3700
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a) 245 + 37 - 45 + 63
= 245 - 45 + 37 + 63
= 200 + 100
= 300
b) 1987 - 538 - 462
= 1987 - ( 538 + 462 )
= 1987 - 1000
= 987
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Câu 1: 456 - 145 - 246
= ( 456 - 246 ) - 145
= 210 - 145
= 65
Câu 2: 162 x 10 + 37 x 10 + 10
= 10 x ( 162 + 37 + 1 )
= 10 x 200
= 2000
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37+98+63+2+10+90
=(37+63)+(98+2)+(10+90)
=100+100+100
=300
tk nhé
37+98+63+2+10+90
=(37+63)+(98+2)+(10+90)
=100+100+100
=300
bn gửi lời mời nha
`37xx25+37xx35+37xx39+37`
`=37xx25+37xx35+37xx39+37 xx 1`
`=37 xx ( 25 + 35 + 39 + 1)`
`=37xx(60 + 39 + 1)`
`=37xx(60+40)`
`=37xx100`
`=3700`
\(37\times25+37\times35+37\times39+37\)
\(=37\times\left(25+35+39+1\right)\)
\(=37\times100=3700\)