a) 25% x X = 42,6 - 3,28
b) X : 40% = 7,25 + 6,75
c) 350% x X = 37,36 + 52,14
d) 50% : X = 53,33 + 42,67
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\(a,25\%x=42,6-3,28\\ \Leftrightarrow\dfrac{1}{4}x=39,32\\ \Leftrightarrow x=157,28\)
\(b,x:40\%=7,25+6,75\\ \Leftrightarrow x:40\%=14\\ \Leftrightarrow x=5,6\)
\(c,\dfrac{7011}{25}:\left(x-42,6\right)=117,14-47,03\\ \Leftrightarrow\dfrac{7011}{25}:\left(x-42,6\right)=70,11\\ \Leftrightarrow x-42,6=4\\ \Leftrightarrow x=46,6\)
\(d,0,3\left(x+\dfrac{1}{3}\right)=\dfrac{1}{2}\cdot\left(0,81:27\right)\\ \Leftrightarrow0,3\left(x+\dfrac{1}{3}\right)=0,015\\ \Leftrightarrow x+\dfrac{1}{3}=0,05\\ \Leftrightarrow x=-\dfrac{17}{60}\)
a) 25% x X = 39.32
X = 39.32 : 25% = 9.83
b) X : 40% = 14
X = 14 x 40% = 5.6
a, 2625 : ( x : 35 ) + 405 = 440
2625 : ( x : 35 ) = 440 - 405
2625 : ( x : 35 ) = 35
x : 35 = 2625 : 35
x : 35 = 75
x = 75 x 35
x = 2625
Vậy x = 2625
a) 7,25×6,93+7,25×2,07+7,25×1
=7,25×(6,93+2,07+1)
=7,25×10
=72,5
b) 24,8:0,5+24,8×8
=24,8×2+24,8×8
=24,8×(2+8)
=24,8×10
=248
a) \(C=75,284\cdot15,137\cdot\left(9,5-4,75\cdot2\right)+231\left(7,25+2,75\right)\)
\(C=75,284\cdot15,137\cdot\left(9,5-9,5\right)+231\cdot10\)
\(C=75,284\cdot15,137\cdot0+2310=2310\)
b) \(D=\left(1000\cdot0,1-900\cdot0,1-90\cdot0,1\right)\left(142\cdot0,5-240\cdot0,25\right)\)
\(D=\left[0,1\left(1000-900-90\right)\right]\left(142\cdot0,5-240\cdot0,5\cdot\frac{1}{2}\right)\)
\(D=\left(0,1\cdot10\right)\left(142\cdot0,5-140\cdot0,5\right)\)
\(D=0,5\left(142-140\right)\)
\(D=\frac{1}{2}\cdot2=1\)
c) \(E=3,54+73+0,23\cdot25+3,54\cdot27+0,17\cdot25\)
\(E=3,54\left(1+27\right)+73+25\left(0,23+0,17\right)\)
\(E=3,54\cdot28+73+25\cdot0,4\)
\(E=99,12+73+10\)
\(E=99,12+1+72+10\)
\(E=100,12+72+10=182,12\)
a) 1/4 x X = 39,32
X = 39,32 : 1/4
X = 157,28
a)x=157,28 c)x=179/7
b)x=5,6. d)x=1/192