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\(\dfrac{25}{100}\) + \(\dfrac{1}{4}\) x 29 + 25% \(\times\) 30 + 0,25 \(\times\) 40
= 0,25+ 0,25 x 29 + 0,25 x 30 + 0,25 x 40
= 0,25 x ( 1 + 29 + 30 + 40)
= 0,25 x 100
= 25
a: \(=\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(\dfrac{18}{21}+\dfrac{3}{21}\right)+\dfrac{19}{32}+\dfrac{13}{32}=1+1+1=3\)
b: \(=35\cdot1.1\cdot25\cdot\left(7,5-7,5\right)=0\)
\(\frac{1}{4}\cdot45+0.25\cdot35+\frac{25}{100}\cdot19+25\%\)
\(=0.25\cdot45+0.25\cdot35+0.25\cdot19+0.25\)
\(=0.25\left(45+35+19+1\right)\)
\(=0.25\cdot100\)
\(=25\)
\(=0,25.45+0,25.35+0,25.19+0,25.1\)
\(=0,25.\left(45+35+19+1\right)\)
\(=0,25.100\)
\(=25\)
\(\dfrac{7}{19}x\dfrac{8}{23}+\dfrac{7}{19}x\dfrac{15}{23}+1\dfrac{7}{19}\)
= \(\dfrac{7}{19}x\left(\dfrac{8}{23}+\dfrac{15}{23}\right)+1+\dfrac{7}{19}\)
=\(\dfrac{7}{19}x1+1+\dfrac{7}{19}\)
= \(\dfrac{7}{19}+1+\dfrac{7}{19}=1\dfrac{14}{19}\) = \(\dfrac{33}{19}\)
\(\dfrac{75}{100}+\dfrac{18}{21}+\dfrac{49}{32}+\dfrac{1}{4}+\dfrac{3}{21}-\dfrac{17}{32}\)
= \(\dfrac{3}{4}+\dfrac{6}{7}+\dfrac{49}{32}+\dfrac{1}{4}+\dfrac{1}{7}-\dfrac{17}{32}\)
= \(\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(\dfrac{6}{7}+\dfrac{1}{7}\right)+\left(\dfrac{49}{32}-\dfrac{17}{32}\right)\)
= 1 + 1 + 1 = 3
\(\dfrac{8}{9}x\dfrac{15}{16}x\dfrac{24}{25}x\dfrac{35}{36}x\dfrac{48}{49}x\dfrac{63}{64}\)
= \(\dfrac{3}{4}\) *Câu này bạn tự sử dụng gạch nhé!
`1,`
`a,`
`7/19 \times 8/23 + 7/19 \times 15/23 + 1 7/19`
`= 7/19 \times 8/23 + 7/19 \times 15/23 + 1 + 7/19`
`= 7/19 \times (8/23 + 15/23 + 1) + 1`
`= 7/19 \times 2 + 1`
`=14/19 + 1`
`= 33/19`
`b,`
`75/100 + 18/21 + 49/32 + 1/4 + 3/21 - 17/32`
`= 75/100 + (18/21 + 3/21) + (49/32 - 17/32) + 1/4`
`= 0,75 + 1 + 1 + 0,25`
`= (0,75 + 0,25) + 1 + 1`
`= 1+1+1=3`
`c,`
`8/9 \times 15/16 \times 24/25 \times 35/36 \times 48/49 \times 63/64`
`=` \(\dfrac{2\times3}{3\times3}\times\dfrac{3\times5}{4\times4}\times\dfrac{3\times4\times2}{5\times5}\times\dfrac{5\times7}{6\times6}\times\dfrac{6\times8}{7\times7}\times\dfrac{7\times9}{8\times8}\)
`= 3/4` (bạn sử dụng gạch, rút gọn các số là được nhé).
4,5 : 0,5 + 25 : 0,25 + 100 : 0,125
= 4,5 * 2 + 25 * 4 + 100 * 8
= 9 + 100 + 800
=809
\(=0,25\times49+0,25+0,25\times31+0,25\times19\\ =0,25\times\left(49+1+31+19\right)\\ =0,25\times100\\ =25\)
`25%×49+25/100+1/4×31+0,25×19`
`=0,25×49+0,25+0,25×31+0,25×19`
`=0,25×(49+1+31+19)`
`=0,25×100`
`=25`