Wykonaj działania:
a) -4·( 2 1/8)
b) -3 1/7 : 11
c) 2 ¼ : (-1 1/2)
d) -1,21+5,1
e) -3,24·(-0,2)
f) 0,24 : (-0,4)
g) 2 3/4·(-0,5)
h) -2,3 - 1/3
i) -3,75: (-1 ¼)
j) 1/3 : (-0,7)
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w załączniku.
a) -4·( 2 1/8) = -4 * 17/8 = -17/2 = - 8 1/2
b) -3 1/7 : 11 = - 22/7 * 1/11 = - 22/77 = -2/7
c) 2 ¼ : (-1 1/2) = 9/4 : (-3/2) = 9/4 * (-2/3) = -18/12= -3/2=-1 1/2
d) -1,21+5,1 = 3,89
e) -3,24·(-0,2) = 0,648
f) 0,24 : (-0,4)= - 0,6
g) 2 3/4·(-0,5) = 11/4 * (-5/10) = -55/40 = -11/8 = - 1 3/8
h) -2,3 - 1/3 = -23/10 – 1/3 = - 69/30 – 10/30 = - 79/30 = -2 19/30
i) -3,75: (-1 ¼) = -375/100 : (-5/4) = -375/100 * (-4/5 ) = 1500/500= 3
j) 1/3 : (-0,7) = 1/3 : (-7/10) = 1/3 * (-10/7) = -10/21