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9/10:(-3/4)= 9/10*(-4/3)= -36/30= -1,2
-7/8:(-5,6)= (-7/8):(-56/10)= (-7/8)*(-10/56)= 70/448= 5/32
(-2,1)-(-4 2/7)= (-21/10)+30/7= (-147/70)+300/70= 153/70= 2¹³/₇₀
(-3,6)*4/9= (-36/10)*4/9= -144/90= -1,6
0,04*(-0,27)= -0,0108
(-9,45)*0,28= -2,646
(-2 2/5)*(-3 3/4)= (-9,4)*(-3,75)= 35,25
1 2/3*(-6/25)= 5/3*(-6/25)= -30/75= -6/15= -2/5
(-100)*8/25= -800/25= -32