Question

Answer 1

Giúp mk bài 2

Answer 2

đây là lớp 5 hả

Answer 3

hay đấy 

Answer 4

\(\dfrac{12x25+4x175x3}{\left(36x100\right)-\left(24x100\right)}\)

=\(\dfrac{12x25+12x175}{360-240}\)

=\(\dfrac{12x\left(25+175\right)}{120}\)

=\(\dfrac{12x200}{120}\)

=\(\dfrac{240}{120}\)

=2

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Answer 5

Bài 2:

a.

\(A=\frac{12\times 25+4\times 175\times 3}{(36\times 101-36)-(24\times 99+24)}=\frac{12\times 25+12\times 175}{36\times (101-1)-24\times (99+1)}\)

\(=\frac{12\times (25+175)}{36\times 100-24\times 100}=\frac{12\times 200}{100\times (36-24)}=\frac{2\times 12\times 100}{100\times 12}=2\)

b.

\(A=\frac{12\times 25+12\times m}{36\times (101-1)-24\times (99+1)}=\frac{12\times (25+m)}{36\times 100-24\times 100}\)

\(=\frac{12\times (25+m)}{100\times (36-24)}=\frac{12\times (25+m)}{12\times 100}=\frac{25+m}{100}\)

\(A=\frac{25+m}{100}=10\)

\(25+m=100\times 10\)

\(25+m=1000\)

\(m=1000-25=975\)

Answer 6

\(10=\dfrac{12x25+12xm}{\left(36x100\right)-\left(24x100\right)}\)

\(10=\dfrac{12x\left(25+m\right)}{360-240}\)

\(10=\dfrac{12x\left(25+m\right)}{120}\)

\(10x120=12x\left(25+m\right)\)

\(1200=12x\left(25+m\right)\)

\(1200:12=25+m\)

\(100=25+m\)

\(m=75\)

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