\(\dfrac{31}{4}\) \(:\) \(2\) \(=\dfrac{31}{4}\) \(\cdot\) \(\dfrac{1}{2}\) \(=\) \(\dfrac{31}{8}\)
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\(\dfrac{31}{4}\) \(:\) \(2\) \(=\dfrac{31}{4}\) \(\cdot\) \(\dfrac{1}{2}\) \(=\) \(\dfrac{31}{8}\)
a)32*31+69*31-31. b) 43*166+14*83. c) 7/2-3/2:x=5/4
tính bằng cách thuận tiện nhất a, 2/7:27/31+4/7:27/31+1/7:27/31
b, 23/45x 17/51:23/45
giúp mik với
Tinh nhanh :
a . 1/4 + 2/5 + 6/8 + 9/15 + 8/1
b . 15/31 * 16/43 + 15/31 * 27 4
2^4.5-[131-(31-4)^2]
Tính:
A]2/5 + 1/2
B]4/3 - 2/7
C]31/35 - 2/7
D]2 - 1/4
E]4/5 + 3
I=4/3+4/15+... +4/255
K=1/3×4+2/4×6+... +7/24×31
tìm x,biết : x - 4 (6 +7 ) x 2 =31
a) X x 3/8 = 31/3 -4
b) X:5 = 8/7 + 2
Tính:
a) 6 - 2/5 + 3/5 x 3
b) ( 31/35 - 4/7 ) x 8/7 : 2