dễ mà

677x847+251/677x847+847-623

=677x847+251/677x847+224

=251/224

rồi tiếp theo nếu rút gọn dc thì bn tự rút gọn nhé nhớ chọn câu tra lời của mih nhs

\(\frac{677\cdot847+251}{678\cdot847-623}\)

\(=\)\(\frac{677\cdot847+251}{\left(677+1\right)\cdot847-623}\)

\(=\)\(\frac{677\cdot847+251}{677\cdot847+847-623}\)

\(=\)\(\frac{677\cdot847+251}{677\cdot847+224}\)

\(=\)\(\frac{251}{224}\)

(677*874+251) : (678*874-623)=1

Mình không biết đúng hay sai nữa.Thông cảm

\(\frac{677\times874+251}{678\times874-623}\)\(=\frac{677\times874+251}{\left(677+1\right)\times874-623}\)\(=\frac{677\times874+251}{677\times874+1\times874-623}\)\(=\frac{677\times874+251}{677\times874+874-623}=\frac{677\times874+251}{677\times874+251}=1\)

\(\frac{677.874+251}{678.874-623}\)

\(=\frac{677.874+251}{\left(677+1\right).874-623}\)

\(=\frac{677.874+251}{677.874-1.874-623}\)

\(=\frac{677.874+251}{677.874+874-623}\)

\(=\frac{677.874+251}{677.874+251}\)

\(=1\)

Hok tốt

\(\frac{637\times527-189}{526\times637+448}\)

\(=\frac{637\times\left(526+1\right)-189}{526\times637+448}\)

\(=\frac{637\times526+637-189}{526\times637+448}\)

\(=\frac{637\times526+448}{526\times637+448}\)

\(=1\)

\(\frac{677\times874+251}{678\times874-623}\)

\(=\frac{677\times874+251}{\left(677+1\right)\times874-623}\)

\(=\frac{677\times874+251}{677\times874+874-623}\)

\(=\frac{677\times874+251}{677\times874+251}\)

\(=1\)

\(\frac{637\times527-189}{526\times637+448}\)

\(=\frac{526\times637+637-189}{526\times637+448}=\frac{526\times637+448}{526\times637+448}=1\)

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c) 637 x 527 - 189=335510  /  526 x 637 + 448=335510

d) 677 x 874 + 251 =591949 /  678 x 874 - 623=591949

học tốt

c, 637x527-189/526x637+448=335918,116

d, 677x874+251/678x874-623=91398,5605

\(\frac{677\times874+251}{678\times874-623}\)

\(=\frac{677\times874+251}{677\times874+874-623}=\frac{677\times874+251}{677\times874+251}\)

\(=1\)

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2 nick là 1 ng ??????

\(\frac{637x527-189}{526x637+448}\)

\(=\frac{527-189}{526+448}\)

\(=\frac{526-188}{526+448}\)

\(=\frac{188}{448}=\frac{47}{112}\)

677*874+251=591949

678*874-623=591949

=591949

kêt quả là 591949 bạn nha

a)  637 x 527 - \(\frac{189}{526}\)x 637 + 448

cai này ra số thập phân đấy

 Bằng 335918,116

b) cái này cũng thế nốt

\(\frac{637\times527-189}{526\times637+448}=\frac{527-189}{526+448}\)

                                    \(=\frac{338}{974}=\frac{169}{487}\)

b) \(\frac{677\times874+251}{678\times874-623}=\frac{677+251}{678-625}\) 

                                      \(=\frac{918}{55}\)

đúng thì ủng hộ 

637x527-189

526x637+448

=637x(526+1)-189 

526x637+448

=637x526+637-189

526x637+448

=637x526+448

526x637+448

=1(vì tử số =mẫu số)