Bằng 1 k đi rồi giải thích

Bằng 1 nha !

=945 * ( 238 + 1 ) - 1

944 + 945 * 238

=945 * 238 + 238

944 + 945 * 238

=1

\(\frac{\left(238+1\right)\cdot945-1}{945\cdot238+944}=\frac{238\cdot945+945-1}{945\cdot238+944}=\frac{945\cdot238+944}{945\cdot238+944}=1\)

\(\frac{945\times239-1}{944+945\times238}\)

\(=\frac{945\times\left(238+1\right)-1}{944+945\times238}\)

\(=\frac{945\times238+945\times1-1}{944+945\times238}\)

\(=\frac{945\times238+944}{944+945\times238}=1\)

\(=\frac{945x239-1}{944+945x\left(239-1\right)}=\frac{945x239-1}{944+945x239-945}=\frac{945x239-1}{945x239-1}=1\)

\(\frac{945x239-1}{944+945x238}\)

=\(\frac{945x\left(238+1\right)-1}{944+945x238}\)

=\(\frac{\left(945x238\right)945-1}{944+945x238}\)

=\(\frac{\left(945x238\right)+944}{944+945x238}\)=1

\(1\frac{1}{2}x1\frac{1}{3}:1\frac{1}{4}:1\frac{1}{5}\)

\(=\frac{3}{2}x\frac{4}{3}:\frac{5}{4}:\frac{6}{5}\)

\(=\frac{3}{2}x\frac{4}{3}x\frac{4}{5}x\frac{5}{6}\)

\(=\frac{4x4}{2x6}=\frac{2x2x4}{2x2x3}=\frac{4}{3}\)

\(1\frac{1}{2}\times1\frac{1}{3}\div1\frac{1}{4}\div1\frac{1}{5}=\frac{3}{2}\times\frac{4}{3}\div\frac{5}{4}\div\frac{6}{5}=\frac{3}{2}\times\frac{4}{3}\times\frac{4}{5}\times\frac{5}{6}\)

                                           \(=\frac{3\times4\times4\times5}{2\times3\times5\times6}=\frac{4}{3}\)

Đáp số : \(\frac{1}{5}\)

Tk mk mk tk lại ! ^^ 

= 1/2 x 2/3 x 3/4 x4/5

= 1x2x3x4/ 2x3x4x5 

=1/5

đề bài hơi sai tí nên cj sửa cho e nha để cho tròn tại số lớn quá với lại xấu 

18,85 × 2010 - 65 × 18,85 -  945 x 18,85

= 18,85 x ( 2010 - 65 - 945) 

= 18,85 x 1000

= 18850

\(18,85\) x \(2010-65\) x \(18,85\) x \(945\)

\(=18,85\) x \(\left(2010-65\right)\) x \(945\)

\(=18,85\) x \(1945\) x \(945\)

\(=18,85\) x \(1838025\)

\(=34646771,25\)