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\(\Leftrightarrow x+1,5x+3,5x=252\)
<=>6x=252
<=>x=42
ủng hộ nhe
a ) \(x+x\times\frac{1}{3}\div\frac{2}{9}+x\div\frac{2}{7}=252\)
\(x\times1+x\times\frac{1}{3}\div\frac{2}{9}+x\div\frac{2}{7}=252\)
\(x\times1+x\times\frac{1}{3}\times\frac{9}{2}+x\times\frac{7}{2}=252\)
\(x\times1+x\times\frac{9}{6}+x\times\frac{7}{2}=252\)
\(x\times\left(1+\frac{9}{6}+\frac{7}{2}\right)=252\)
\(x\times6=252\)
\(x=252\div6\)
\(x=42\)
b ) \(\left(3\times x-0,8\right)\div x+14,5=15\)
\(\left(3\times x-0,8\right)\div x=15-14,5\)
\(\left(3\times x-0,8\right)\div x=0,5\)
\(0,8\div x=3-0,5\)
\(0,8\div x=2,5\)
\(x=0,8\div2,5\)
\(x=0,32\)
\(x+x\times\frac{1}{3}:\frac{2}{9}+x:\frac{2}{7}=252\)
\(x+x\times\frac{3}{2}+x\times\frac{7}{2}=252\)
\(x\times\left(1+\frac{3}{2}+\frac{7}{2}\right)=252\)
\(x\times6=252\)
\(x=252:6\)
\(x=42\)
X + X x \(\frac{1}{3}\)x\(\frac{9}{2}\)+ X x\(\frac{7}{2}\)= 252
X + X x \(\frac{3}{2}\)+ X x \(\frac{7}{2}\)= 252
X x (\(\frac{3}{2}\)+ \(\frac{7}{2}\)+1) = 252
X x (\(\frac{3}{2}\)+ \(\frac{7}{2}\)+ \(\frac{2}{2}\)) = 252
X x 6 = 252
X = 252 : 6
X= 42
Chúc bạn học tốt! ^^
<=>x.1+x.3/2+x.7/2=252
x.(1+3/2+7/2)=252
x.6=252
x=252:6
=>x=42
\(x+x\times3:\frac{2}{9}+x:\frac{2}{7}=252\)
\(x+x\times\left(3:\frac{2}{9}\right)+x\times\frac{7}{2}=252\)
\(x+x\times\frac{27}{2}+x\times\frac{7}{2}=252\)
\(x\times\left(1+\frac{27}{2}+\frac{7}{2}\right)=252\)
\(x\times18=252\)
\(x=14\)
a)
\(x.\frac{7}{9}=\frac{2}{3}+2\frac{1}{2}\)
\(x.\frac{7}{9}=\frac{19}{6}\)
\(x=\frac{19}{6}:\frac{7}{9}\)
\(x=\frac{57}{14}\)
b) \(\frac{5}{7}+x:\frac{9}{4}=\frac{4}{3}\)
\(x:\frac{9}{4}=\frac{4}{3}-\frac{5}{7}\)
\(x:\frac{9}{4}=\frac{13}{21}\)
\(x=\frac{13}{21}.\frac{9}{4}\)
\(x=\frac{39}{28}\)
Xin lỗi bạn nhé mình chỉ làm được bài 2 thôi!
Bài 2:
a) y + y x 1/3 : 2/9 + y : 2/7 = 252
y x 1 + y x 1/3 x 9/2 + y x 7/2 = 252
y x 1 + y x 3/2 + y x 7/2 = 252
y x ( 1 + 3/2 + 7/2) = 252
y x 6 = 252
y = 252 : 6
y =42
b) ( 324 : 3 + 12 - y) : 7 = 3
( 108 + 12 - y) = 3 x 7
120 - y = 21
y = 120 - 21
y 99
3528/39
\(x+x\times\frac{1}{3}\div\frac{2}{9}+x\div\frac{2}{7}=252\)
\(\Leftrightarrow x+x\times\frac{1}{3}\times\frac{9}{2}+x\times\frac{7}{2}=252\)
\(\Leftrightarrow x\left(1+\frac{1}{3}\times\frac{9}{2}+\frac{7}{2}\right)=252\)
\(\Leftrightarrow x\left(\frac{6}{6}+\frac{9}{6}+\frac{21}{6}\right)=252\)
\(\Leftrightarrow x\times\frac{36}{6}=252\)
\(\Leftrightarrow x\times6=252\)
\(\Leftrightarrow x=252\div6\)
\(\Leftrightarrow x=43\)