Question

[Nguyễn Thị kim Oanh]

tinh nhanh

99-97+95-93+91-89+.....7-5+3-1

32x47+32-53+168+79+132

25/2+25/3-25/7/1/3+1/3-1/7

Answer 1

[Yuan Bing Yan _ Viên Băng Nghiên]

99-97+95-93+91-89+...+7-5+3-1

Số các số hạng là:

(99-1):2+1=50 số

=(99-97)+(95-93)+(91-89)+...+(7-5)+(3-1)

Số cặp sẽ là:

50:2=25 cặp

=2+2+2+...+2+2

=2x25

=50

32x47+32-53+168+79+132

=1504+32-53+(168+79+132)

=1536-53+379

=1483+379

=1862

25/2+25/3-25/7/1/3+1/3-1/7

\(=\frac{25}{2}+\frac{25}{3}-\frac{25}{7}:\frac{1}{3}+\frac{1}{3}-\frac{1}{7}\)

\(=\frac{25}{2}+\frac{25}{3}-\frac{25}{7}\times\frac{3}{1}+\frac{1}{3}-\frac{1}{7}\)

\(=\frac{25}{2}+\frac{25}{3}-\frac{156}{7}+\frac{1}{3}-\frac{1}{7}\)

\(=\frac{525}{42}+\frac{350}{42}-\frac{936}{42}+\frac{14}{42}-\frac{6}{42}\)

\(=\frac{875}{42}-\frac{936}{42}+\frac{14}{42}-\frac{6}{42}\)

\(=\frac{-61}{42}+\frac{14}{42}-\frac{6}{42}\)

\(=\frac{-47}{42}-\frac{6}{42}\)

\(=\frac{-53}{42}\)

( Chú Ý: lớp 5 chưa học số âm )