Question

[Phan vũ Hà Linh]

Tìm x:

A) 7,5 *x + x* 3,5=39,93

B) x:4+x = 3,75

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Ai nhank mk tick cho

Answer 1

[Cô nàng cự giải]

\(a.7,5\times x+x\times3,5=39,93\)

\(\Rightarrow x\times\left(7,5+3,5\right)=39,93\)

\(\Rightarrow x\times11=39,93\)

\(\Rightarrow x=39,93:11\)

\(\Rightarrow x=3,63\)

\(b.x:4+x=3,75\)

\(\Rightarrow x:\frac{4}{1}+x=3,75\)

\(\Rightarrow x\times\frac{1}{4}+x=3,75\)

\(\Rightarrow x\times\left(\frac{1}{4}+1\right)=3,75\)

\(\Rightarrow x\times1,25=3,75\)

\(\Rightarrow x=3,75:1,25\)

\(\Rightarrow x=3\)

Answer 2

[nguyen van minh]

a) 7,5 *x + x*3,5=39,93

(7,5 + 3,5) * x=39,93

11 * x = 39,93

x= 39,93 : 11

x= 3,63

b)x : 4 + x=3,75

x * 1/4 + x *1 =3,75

x * (1/4 + 1) = 3,75

x * 5/4 = 3,75

x = 3,75 : 5/4

x= 3