tính nhanh \(\frac{29\cdot15-14}{29\cdot14+15}\) = ?
Tính nhanh:
\(\frac{126\cdot14\cdot12\cdot148\cdot333\cdot15}{74\cdot21\cdot9\cdot37\cdot8\cdot16\cdot18}\)
Giải nhanh hộ mik nha!!
tính
B = \(\frac{5}{2\cdot1}+\frac{4}{1\cdot11}+\frac{3}{11\cdot2}+\frac{1}{2\cdot15}+\frac{3}{15\cdot14}\)
đề sai rồi 13/15.4 chứ
B.1/7=1/7.(5/2.1+4/1.11+3/11.2+1/2.15+13/15.14)
B.1/7=5/2.1.7+4/1.11.7+3/11.2.7+1/2.15.7+13/15.4.7)
B.1/7=5/2.7+4/7.11+3/11.14+1/14.15+13/15.28
B.1/7=1/2-1/7+1/7-1/11+1/11-1/14+1/14-1/15+1/15-1/28
B.1/7=1/2-1/28=13/28
B=13/28:1/7
B=13/4
Tính nhanh:
\(\frac{-15}{29}+\frac{7}{-13}-1\frac{2}{13}:\frac{29}{31}+\frac{15}{29}.\frac{-5}{13}\)
Tính nhanh giá trị biểu thức sau:
10/29+11/29+12/29+13/29+14/29+15/29+16/29+17/29+18/29+19/29
Có lời giải chi tiết giúp với ạ
10/29+11/29+12/29+...+19/29
=10+11+12+13+14+15+=16+17+18+19/29
=145/29
Tính \(A=\left(\frac{1}{4\cdot9}+\frac{1}{9\cdot14}+\frac{1}{14\cdot19}+...+\frac{1}{44\cdot49}\right)\cdot\frac{1-3-5-7-...-49}{89}\)
\(B=\frac{5\cdot4^{15}\cdot9^9-4\cdot3^{20}\cdot8^9}{5\cdot2^{10}\cdot6^{19}-7\cdot2^{29}\cdot27^6}-\frac{2^{19}\cdot27^3+15\cdot4^9\cdot9^4}{6^9\cdot2^{10}+12^{10}}\)
bài này không khó. Nhưng đánh máy để giải cho bạn thì thực sự khó
Bài 1:Tính nhanh
34*(29-14)+14*(34-29)
Tính nhanh
-15/29 . 7/8 - 15/29 . 3/8 + 15/29 : 4/3
\(\frac{-15}{29}.\frac{7}{8}-\frac{15}{29}.\frac{3}{8}+\frac{15}{29}:\frac{4}{3}\)
\(=\left(\frac{-15}{29}\right)\left(\frac{7}{8}+\frac{3}{8}-\frac{6}{8}\right)\)
\(\left(\frac{-15}{29}\right).\frac{1}{2}=\frac{-15}{58}\)
-15/29 . 7/8 - 15/29 . 3/8 + 15/29 : 4/3 = 15/29 . -7/8 - 15/29 . 3/8 + 15/29 . 3/4
=15/29 . ( -7/8 - 3/8 + 3/4)
=15/29. -1/2
=-15/58
\(\left(4\frac{5}{37}-3\frac{4}{5}+8\frac{15}{29}\right)-\left(3\frac{5}{37}-6\frac{14}{29}\right)\)
\(\left(4\frac{5}{37}-3\frac{4}{5}+8\frac{15}{29}\right)-\left(3\frac{5}{37}-6\frac{14}{29}\right)\)