12 + 23 + 45 + 67 = ?
256, 23 + 12, 56 =
56, 23 + 12, 45 =
89, 67 - 23, 45 =
1, 23 + 34, 67
19, 56 + 45, 65 =
tính bằng cách hợp lí nhất
a) 31/23 - (7/23 + 8/23)
b) (1/3 + 12/67 + 13/41 ) - (79/67 - 28/41 )
c) 38/45 - ( 8/45 - 17/51- 3/11 )
Tính hợp lí: a. 31/23 - (7/23 + 8/23). b.(1/3 + 12/67+13/41) - (79/67 - 28/41). c. 38/45 - (8/45 - 17/51 - 3/11)
\(a\frac{31}{23}-\left(\frac{7}{23}+\frac{8}{23}\right)\)
\(=\frac{31}{23}-\frac{7}{23}-\frac{8}{23}\)
\(=\frac{16}{23}\)
Hot
tốt
!
a)\(\frac{31}{23}-\left(\frac{7}{23}+\frac{8}{23}\right)=\frac{31}{23}-\frac{8}{23}+\frac{7}{23}=1+\frac{7}{23}=1\frac{7}{23}\)
b)\(\left(\frac{1}{3}+\frac{12}{67}+\frac{13}{41}\right)-\left(\frac{79}{67}-\frac{28}{41}\right)=\left(\frac{13}{41}+\frac{28}{41}\right)+\left(\frac{79}{67}-\frac{12}{67}\right)-\frac{1}{3}=1+1-\frac{1}{3}\)
\(=2-\frac{1}{3}=\frac{5}{3}\)
2/15-2/65-4/39
32/13-(7/23+8/23)
(1/3+12/67+13/41) - (79/67 - 28/41)
38/45 - (8/45-17/51-3/11)
2/15-2/65-4/39=4/39-4/39=0
32/13-(7/23+8/23)=32/13-15/23=541/299
(1/3+12/67+13/41) - (79/67 - 28/41)=6836/8241-1363/2747=1/3
38/145 - (8/45-17/51-3/11)=38/145-(-212/495)=1982/2871
12*23*34*45*56*67*78*89
12 * 23 * 34 * 45 * 56 * 67 * 78 * 89 = 10 998 867 035 520
tk mk nha
hihi yêu mọi người nhiều lắm đấy
=10998867035520 nha nhunge mà hơi to
12+23+34+45+56+67+78+89=?
Câu hỏi :
12 + 23 + 34 + 45 + 56 + 67 + 78 + 89 = ?
Trả lời :
12 + 23 + 34 + 45 + 56 + 67 + 78 + 89 = 404
Chúc bạn học tốt !
12 + 23 + 34 + 45 + 56 + 67 + 78 + 89
= ( 12 + 89 ) + ( 23 + 78 ) + ( 34 + 67 ) + ( 45 + 56 )
= 101 + 101 + 101 + 101
= 101 x 4
= 404.
1+12+23+34+45+56+67+78+89
1 + 12 + 23 + 34 + 45 + 56 + 67 + 78 + 89
= (1 + 89) + (12 + 78) + (23 + 67) + (34 + 56) + 45
= 90 + 90 + 90 + 90 + 45
= 90 x 4 + 45
= 360 + 45
= 405
23+34+45+56+67+78+89+90+12+
Hảo đề . Sau 12 còn cộng thêm j ko?
9/10 - 13/75 - 1/6
2/15 - 2/65 - 4/39
31/23 - (7/32 + 8/23)
(1/3+12/67+13/41) - (79/67 - 28/41)
38/45 - (8/45 - 17/51- 3/11)