а) -5,4-(-2)=+10,8
б)-48/0,8=-480/8= -60
в)5/9 *(-1 2/7)=5/9*(-9/7)=-5/7
г)(-3,9)* 4/7 +3/7 *(-3,9)= -3,9(4/7 + 3/7)= -3,9*1= -3,9
д)-2/9*6,5 - 2/9 *11,5=-2/9(6,5+11,5)= -2/9*18= -4
е)-8*(-3+12)/36+2= -8*9/36+2=-8*4+2=-32+2= -30
ж)(-1/3 + 5/9)/(-2 1/6)=(5/9-3/9)/(-13/2)= 2/9 / (-13/2)= -4/117
з)=(2/4 - 3/4)/(-11/4)=-1/4/(-11/4)=+1/11
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Answers & Comments
а) -5,4-(-2)=+10,8
б)-48/0,8=-480/8= -60
в)5/9 *(-1 2/7)=5/9*(-9/7)=-5/7
г)(-3,9)* 4/7 +3/7 *(-3,9)= -3,9(4/7 + 3/7)= -3,9*1= -3,9
д)-2/9*6,5 - 2/9 *11,5=-2/9(6,5+11,5)= -2/9*18= -4
е)-8*(-3+12)/36+2= -8*9/36+2=-8*4+2=-32+2= -30
ж)(-1/3 + 5/9)/(-2 1/6)=(5/9-3/9)/(-13/2)= 2/9 / (-13/2)= -4/117
з)=(2/4 - 3/4)/(-11/4)=-1/4/(-11/4)=+1/11