oblicz :
1.(-7) * 1 4/5 -(- 48,6)=
2.36: (-3)*(-7 - (odjąć) 5) =
3. Podwojona suma liczb 16 1/6 i -4 2/3
4. iloczyn liczb -7 i -3 pomniejszony o 10
5.iloczyn sumy liczb - 15 1/2 i -1/2 oraz ich różnicy
6.(-4 3/7)* (-9,4 + 2 2/5
7. odwrotność liczby ( - 1 1/3) : ( - 28)
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1. (-7) * 1 4/5 -(- 48,6)=(-7)*9/5-(-48,6)=12 3/5-(-48,6)=12,6-(-48,6)=36
2.36: (-3)*(-7-5)=-12*(-7-5)=-12*(-12)=144
3.[16 1/6+(-4 2/3)]*2=[16 1/6+(-4 4/6)]*2=11 3/6*2=
= 11 1/2*2=69/6*2=138/6=23
4. -7*(-3)-10=-21-10=-11
5. [-15 1/2 +(-1/2)]*[-15 1/2 -(-1/2)]=[31/2+(-1/2)]*[31/2-(-1/2]=30/2*32/2=
= 1020/4=255
6.(-4 3/7)* (-9,4 + 2 2/5)=-31/7*(-9,4+2,4)=31/7*(-7)=-217/7=-31
7.( - 1 1/3) : ( - 28)=(-4/3):(-28)=(-4/3)*(-1/28)=4/84=1/21
odwrotność liczby 1/21 to 21
1. ... = (-7) * 1,8 + 48,6 = - 12,6 + 48,6 = 61,2
2. ... = 36 : (-3) * (-13) = 36 : 3 * 13 = 12 * 13 = 156