a) \(x+1,23\div3=1,845\) c) Không rõ
\(x+0,41=1,845\)
\(x=1,845-0,41\)
\(x=1,435\)
b) \(x\times\frac{1}{4}+x\times\frac{1}{5}+x\times2=19,6\) d) \(x+3\frac{1}{2}+20=24\frac{1}{4}\)
\(x\times\left(\frac{1}{4}+\frac{1}{5}+2\right)=19,6\) \(x+\frac{7}{2}+20=\frac{97}{4}\)
\(x\times\frac{49}{20}=19,6\) \(x+\frac{47}{2}=\frac{97}{4}\)
\(x=19,6\div\frac{49}{20}\) \(x=\frac{97}{4}\div\frac{47}{2}\)
\(x=8\) \(x=\frac{97}{94}\)
X + 1,23 : 3 = 1,845
X + 0,41 = 1,845
X = 1,845 - 0,41
= 1,435
X x 1/4 + X x 1/5 + X x 2 = 19,6
X x ( 1/4 + 1/5 + 2 ) = 19,6
X x 2,45 = 19,6
X = 19, 6 : 2, 45
X = 8
X + 1,23 : 3 = 1,845 X x 1/4 + X x 1/5 + X x 2 = 19,6
X + 0,41 = 1,845 X x (1/4 + 1/5 + 2) = 19,6
X = 1,845 - 0,41 X x 49/20 = 19,6
X = 1,435 X = 19,6 : 49/20
X = 8
X/2 + X + X x 4 = 23,1 X + 3 1/2 + 20 = 24 1/4
X : 2 + X x 1 + X x 4 = 23,1 X + 7/2 + 20 = 97/4
X x 0,5 + X x 1 + X x 4 = 23,1 X + 47/2 = 97/4
X x ( 0,5 + 1 + 4 ) = 23,1 X = 97/4 - 47/2
X x 5,5 = 23,1 X = 3/4
X = 23,1 : 5,5
X = 4,2
Trả lời (Mik chia thành a, b, c, d cho dễ nhớ nha):
a) \(x+1,23\div3=1,845\)
\(x+0,41=1,845\)
\(x=1,845-0,41\)
\(x=1,435\)
b) \(x\times\frac{1}{4}+x\times\frac{1}{5}+x\times2=19,6\)
\(x\times\left(\frac{1}{4}+\frac{1}{5}+2\right)\)
\(x\times\left(0,25+0,2+2\right)=19,6\)
\(x\times\left(0,45+2\right)=1,96\)
\(x\times2,45=1,96\)
\(x=1,96\div2,45\)
\(x=0,8\)
(Cho mik sửa lại phần c đã nha)
c) \(x\div2+x+x\times4=23,1\)
\(x\div2+x\times1+x\times4=23,1\)
\(x\times0,5+x\times1+x\times4=23,1\)
\(x\times\left(0,5+1+4\right)=23,1\)
\(x\times\left(1,5+4\right)=23,1\)
\(x\times5,5=23,1\)
\(x=23,1\div5,5\)
\(x=4,2\)
d) \(x+3\frac{1}{2}+20=24\frac{1}{4}\)
\(x+3\frac{1}{2}=24\frac{1}{4}-20\)
\(x+3\frac{1}{2}=4\frac{1}{4}\)
\(x=4\frac{1}{4}-3\frac{1}{2}\)
\(x=3\frac{5}{4}-3\frac{1}{2}\)
\(x=\frac{3}{4}\)(ko tìm ra đc hỗn số)
Chúc bn học tốt (Viết xong mỏi hết cả tay òi).
