X x 1,25 + 5,61 = 6,485
x.1,25=6,485-5,61
x.1,25=0,875
x=0,875:1,25
x=0,7
X x 1,25 = 6,485 - 5,61 15,91 : X = 56,54 : 17,8
X x 1,25 = 0,875 15,91 : X = 3,176
X = 0,875 : 1,25 X = 15,91 : 3, 176
X = 0,7 X = 5,009
x.1,25=6,485-561
x.1,25=?
x=?:1,25
x=?
x.17,8=15,91:56,54
x.17,8=?
x=?:17,8
x=?
X x 1,25 + 5,61=6,485
X x 1,25 =6,485+5,61
X x1,25 =12,068
X =12,068 chia 1,25
X =9,6544
mình Ko có dấu chia nên viết = chữ nhé
a) \(x\cdot1.25+5.61=6.485\)
\(x\cdot\frac{5}{4}+\frac{561}{100}=\frac{1297}{200}\)
\(x\cdot\frac{5}{4}=\frac{1297}{200}-\frac{561}{100}\)
\(x\cdot\frac{5}{4}=\frac{1297}{200}-\frac{1122}{200}\)
\(x\cdot\frac{5}{4}=\frac{7}{8}\)
\(x=\frac{\frac{7}{8}}{\frac{5}{4}}\)
\(x=\frac{7}{10}\)
b) \(\frac{15.91}{x}\cdot17.8=56.54\)
\(\frac{\frac{1591}{100}}{x}\cdot\frac{89}{5}=\frac{2827}{50}\)
\(\frac{\frac{1591}{100}}{x}=\frac{\frac{2827}{50}}{\frac{89}{5}}\)
\(\frac{\frac{1591}{100}}{x}=\frac{2827}{890}\)
\(\Rightarrow2827x=\frac{1591}{100}\cdot890\)
\(\Rightarrow2827x=\frac{141599}{10}\)
\(\Rightarrow x=\frac{141599}{10\cdot2827}=\frac{141599}{28270}\)
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