a,(-25) .125.4.(-8) .(-17)
b,-3\4+2\7+-1\4+3\5+5\7
c,7\19.8\11+7\19.3\11-12\19
d,19 5\8:7\2013-26 5\8:7\2013
e,-5\12.2\11+-5\12.9\11+5\12
B1: Bỏ ngoặc rồi thực hiện phép tính (phân số)
a) (-5/11) - (7/19 - 5/31)
b) - ( 11/14 - 8/19) + (3/14 - 8/19)
B2: Tím số nguyên x, biết
-5/24 - 1/3 < x/24 < -1/8 + 1/3
\(\frac{5}{\frac{\frac{19}{3}}{19}-}-\frac{5}{\frac{14}{\frac{3}{14}+\frac{3}{11}}}+\frac{5}{11}\)
bài 1 tính
a) (3/7+-9/8)+(5/8+-6/14)
b) (-5/7+3/11)+(-11/14+14/-11)
c)(-4/5+2/3)+(-5/4+19/5)+(7/3.2)
d)9/16.13/4-9/4.5/16+9/16.17/4
-7/11.1+/19+-7/19.8/11-4/11
Đưa thừa số chung ra ngoài a, 5/7 . 5/11 + 5/7 . 2/11 - 5/7 . 14/11 b, 19 5/8 : 7/12 - 15 1/4 : 7/12 c, 2/5 . 1/3 - 2/15 : 1/5 + 3/5 . 1/3 d, 4/9 . 19 1/3 - 4/9 . 39 1/3
Tính hợp lý:
a) ( -5/6 + 2/5) : 3/8 + ( 4/5 - 11/30) : 3/8
b) (-3/4 + 2/5) : 3/7 + ( 3/5 + -1/4) : 3/7
c)-13/18 . 5/8 + -5/18 . 2/9 + -13/18 . 3/8 + -5/18 . 7/9
d) -11/19 . 4/9 + -8/19 . 3/7 + -11/19 . 5/9 + -9/19 . 4/7
1 Tính
a.11/4×(-0,4)×-1,6×11/4
b.6/19×-7/11+6/19×-4/19×-4/11+13/19
c.2/5×3/7+-3/7×3/5+3/7
d.2/3×5+2×5/7+2/7×9+...+2/97×99