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20,23 \(\times\) 37 - 2,3 \(\times\) 5,5 + 20,23 \(\times\) 63 - 2,3 \(\times\) 4,5
= ( 20,23 \(\times\) 37 + 20,23 \(\times\) 63 ) - ( 2,3 \(\times\) 5,5 + 2,3 \(\times\) 4,5)
= 20,23 \(\times\) ( 37 + 63) - 2,3 \(\times\) ( 5,5 + 4,5)
= 20,23 \(\times\) 100 - 2,3 \(\times\) 10
= 2023 - 23
= 2000
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Tính bằng cách thuận tiện :
37 x 68 + 123 x 74
= 37 x 68 + 123 x 2 x 37
= 37 x 68 + 246 x 37
= 37 x ( 246 + 68 )
= 37 x 314
= 11618
37 x 68 + 123 x 74
= 37 x 68 + 123 x 2 x 37
= 37 x 68 + 37 x 246
= 37 x ( 68 + 246 )
= 37 x 314
= 11618
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19/37+1-19/37
=(19/37-19/37)+1
=0+1
=1
9/8-(17/7-3/7)+7/8
=(9/8+7/8)-(17/7-3/7)
=2-2
=0
1/2+3/4+1/2
=(1/2+1/2)+3/4
=1+3/4
=7/4
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\(\frac{37}{35}:\frac{5}{4}:\frac{74}{25}\)
\(=\frac{37}{35}:\left(\frac{5}{4}\times\frac{74}{25}\right)\)
\(=\frac{37}{35}:\frac{37}{10}\)
\(=\frac{2}{7}\)
\(\frac{37}{35}:\frac{5}{4}:\frac{74}{25}\)
=\(\frac{37}{35}x\frac{4}{5}x\frac{25}{74}\)
\(=\left(\frac{37}{35}x\frac{25}{74}\right)x\frac{4}{5}\)
\(=\frac{1}{7}x\frac{5}{2}x\frac{4}{5}\)
\(=\frac{1x5x2x2}{7x2x5}\)
\(=\frac{2}{7}\)
251/431 x 29/ 37 + 251/431 x 8/ 37
= 251/431 x (29/ 37 + 8 /37)
= 251/ 431 x 37/37
= 251/ 431 x 1 = 251/431