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a) \(0,75\times26+49\times\frac{3}{4}+\frac{3}{4}\times24+\) \(0,75\)
\(=\) \(0,75\times\left(26+1\right)+\frac{3}{4}\times\left(49+24\right)\)
\(=\) \(\frac{3}{4}\times27+\frac{3}{4}\times73\)
\(=\) \(\frac{3}{4}\times\left(27+73\right)\)
\(=\)\(\frac{3}{4}\times100=75\)
b) câu b,c làm tương tự
= 3/4 x y + 3/4 x y + y = 30
=y x( 3/4 + 3/4 + 1 ) = 30
y x 2,5 = 30
y = 30 : 2, 5
y = 12
chúc bn hok tốt @_@
= 3/4 x y + 3/4 x y + y = 30
=y x( 3/4 + 3/4 + 1 ) = 30
y x 2,5 = 30
y = 30 : 2, 5
y = 12
k cho mk nha
= 0,75 x 0,25 + 0,75 x 1,25 - 0,75 x 0,5
= 0,75 x ( 0,25 + 1,25 - 0,5 )
= 0,75 x 1
= 0,75
\(\frac{75}{100}+\frac{3}{4}\times29+75\%\times30+0,75\times40\)
\(=0,75+0,75\times29+\frac{75}{100}\times30+0,75\times40\)
\(=0,75\times1+0,75\times29+0,75\times30+0,75\times40\)
\(=0,75\times\left(1+29+30+40\right)\)
\(=0,75\times100\)
\(=75\)
(1995 : 0,25 - 1996 : 4) x 101 x 102 x (3:4 - 0,75)
= (1995 - 0,25 - 1996:4) x 101 x 102 x 0
= 0
( 1995 : 0,25 - 1996 : 4 ) x 101 x 102 x ( 3 : 4 - 0,75 )
= ( 1995 : 0,25 - 1996 : 4 ) x 101 x 102 x ( 0,75 - 0,75 )
= ( 1995 : 0,25 - 1996 : 4 ) x 101 x 102 x 0
= 0
\(\left(0,75\times64-32\times2\times\frac{3}{4}\right):\left(0,25\times19\times2\times2017\right)\)
= \(\left[64\times\left(0,75-\frac{3}{4}\right)\right]:\left(0,25\times19\times2\times2017\right)\)
= \(\left(64\times0\right):\left(0,25\times19\times2\times2017\right)\)
= \(0:\left(0,25\times19\times2\times2017\right)\)
= \(0\)
1) 2,75 - 5/6 × 2/5 = 2,75 - (5/6) × (2/5) = 2,75 - 1/3 = 2,75 - 0,33 = 2,42
2) 1,25 - (5/6 - 0,75) - 3/5 = 1,25 - (5/6 - 0,75) - 3/5 = 1,25 - (5/6 - 3/4) - 3/5 = 1,25 - (5/6 - 9/12) - 3/5 = 1,25 - (10/12 - 9/12) - 3/5 = 1,25 - 1/12 - 3/5 = 1,25 - 0,08 - 0,6 = 1,25 - 0,68 = 0,57
3) 4/9 × 0,75 + 8/5 + 3,125 = (4/9) × 0,75 + 8/5 + 3,125 = 0,44 + 8/5 + 3,125 = 0,44 + 1,6 + 3,125 = 0,44 + 4,725 = 5,165
4) 1,125 - 4/7 - 0,12 = 1,125 - (4/7) - 0,12 = 1,125 - 0,57 - 0,12 = 0,435 - 0,12 = 0,315
5) (1/3 + 0,4) × 3,5 + (1/6 + 0,75) × 6/5
=3/4.0,25+3/4.1,25-3/4.0,5
=3/4.(0,25+1,25-0,5)
=3/4.10
=15/2
\(x\times0,75-x\div4=3\)
\(\Leftrightarrow x\times\frac{3}{4}-x\times\frac{1}{4}=3\)
\(\Leftrightarrow x\times\left(\frac{3}{4}-\frac{1}{4}\right)=3\)
\(\Leftrightarrow x\times\frac{1}{2}=3\)
\(\Leftrightarrow x=6\)
Vậy \(x=6\)
X x 0,75 - X : 4 = 3
X x 0,75 - X x 0,25 =3
X x(0,75+0,25) =3
X x 1 =3
X =3:1
X =3