wykonaj obliczenia(postaraj się liczyć w pamięci)
a)-21-7, -18+6 , -14-(-23)
b)-6 *7 ,-8 * (-9) , -75 : 3
c)3/5+2i2/5 , 5 i9/11+6/11, 1 i 4/7 +2 i 5/7
d)10-1/3, 12 i 1/5 -4/5 , 3 i 1/7 -4
e)2/11*5 , 5/8 * 1/3 , (-2/3)* (-2/7)
f)2/5 :3 , 3/7:1/2 , -5/8 :1/3
g)0,8 +0,4 ,1,2 -0,7 ,2,1 -3
h)0,3 *2 , 1,6*(-3) , 0,4 :2
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a) -21-7=-28 , -18+6= -12 , -14-(-23)= -14+23=9
b) -6*7= -42 , -8*(-9)= 72 , -75:3= -25
c) 3/5+2i2/5=3 , 5i9/11+6/11= 6i4/11 , 1i4/7 +2i5/7=4i2/7
d) 10- 1/3= 9i2/3 , 12i1/5 -4/5= 11i2/5, 3i1/7-4= - 6/7
e) 2/11*5=10/11 , 5/8*1/3= 5/24 , (-2/3)*(-2/7)= 4/21
f) 2/5:3=2/5*1/3=2/15 , 3/7:1/2=3/7*2=6/7 , -5/8:1/3=-5/8*3= -1i7/8
g) 0,8+0,4=1,2 , 1,2-0,7=0,5 , 2,1-3= -0,9
h) 0,3*2=0,6 , 1,6*(-3)= -4,8 , 0,4:2=0,2
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