Question

[༂d̲̅a̲̅r̲̅k̲̅☬s̲̅t̲̅a̲̅r̲̅➻]

Bài 1: Tinhs giá trị của biểu thức

a) 2,45 x [ 3,45 + 5,6 ] - 13,67

b) 46,75 : [ 12,45 - 3,15 ] x 24,5

Bài 2:Tìm x,biết:

a) 18,355 + x = 23,61

b) 225,35 - x = 169,5

c) x : 2,5 = 5,63

d) x : 100 = 6,175

Answer 1

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bài 1:

a)=8.5025

b)=123.1586022...

bài 2

a)x=5.255

b)x=394.85

c)x=14.075

d)x=617.5

Answer 2

[Lê Thị Thanh Huyền]

\(\)Bài 1:

\(a)2,45\times\left(3,45+5,6\right)-13,67\)

\(=2,45\times9,05-13,67\)

\(=22,1725-13,67\)

\(=8,5025\)

\(b)46,75:\left(12,45-3,15\right)\times24,5\)

\(=46,75:9,3\times24,5\)

\(=\frac{935}{186}\times\frac{49}{2}\)

\(=\frac{45815}{372}\)

\(\)Bài 2:

\(a)18,355+x=23,61\)

\(x=23,61-18,355\)

\(x=5,255\)

\(b)225,35-x=169,5\)

\(x=225,35-169,5\)

\(x=55,85\)

\(c)x:2,5=5,63\)

\(x=5,63\times2,5\)

\(x=14,075\)

\(d)x:100=6,175\)

\(x=100\times6,175\)

\(x=6175\)