1 Wykonaj działanie :
A) 2/5+0,3+(0,8-1/2)=
B) 0,9:1.5+1/3-3/5=
C) (1:0,3-21/3)-5/6=
E) 26/7:7/11:3,4=
F) 6 2/3*(0,25+1/5)
G) 1 5/9:1 1/3*0,76
H)3 1/3 - 1/3 *0/6
i) 3 4/9 - 1 2/3 * 1,8
j) 4,5 * 5 5/9 + 6,4 * 3/8
Podręcznik Matematyka wokół nas dla 1 gim ;]
* = równa sie
+=dodać
- = odiąć
: = podzielić
Jak by ktoś miał ćw to mógłby napisać jeszcze zadanie 2 str 16 ;]
z góry dzięki daje naj;]
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A) 2/5 +0,3 +(0,8-1/2) = 0,4 + 0,3 +(0,8-0,5)= 0,7 + (0,3) = 1
B) 0,9:1,5 +1/3 -3/5 = 0,6 + 1/3 -3/5 = 6/10+1/3-3/5= 18/30 +10/30 -18/30=
= 10/30 = 1/3
C) (1:0,3 - 2i1/3) - 5/6 = (1:3/10 - 2i1/3)- 5/6 = (1*10/3 - 2i1/3)-5/6 =
=(10/3- 2i1/3) -5/6 = 1 -5/6 = 6/6 - 5/6 = 1/6
E) 26/7 : 7/11 : 3,4 = 26/7*11/7 : 34/10 = 286/49 * 10/34 = 143/49*10/17=
= 1 430/ 833 = 1 i 597/833
F) 6i2/3 * (0,25+ 1/5) = 20/3 * (0,25 + 0,2) = 20/3 * 0,45 = 20/3*45/100 =
= 1/1 * 15/5 = 15/5 = 3
G) 1 i5/9 : 1i1/3 * 0,76 = 14/9 : 4/3 * 76/100 = 14/9 : 1/3 * 76/25 =
= 14/9 : 76/75 = 14/9 * 75/76 = 7/3 * 25/38 = 175/114 = 1i61/114
H) 3i1/3 -1/3 * 0,6 = 3 i1/3 -1/3 *6/10 = 3i1/3 -1/1 * 2/10 = 3i1/3 - 2/10=
= 3 i10/30 - 6/30 = 3 i 4/30 = 3 i 2/15
i) 3i4/9 - 1i2/3 * 1,8 = 3i4/9 - 5/3 * 18/10 = 3i4/9 - 1/1 *6/2 = 3i4/9 - 6/2=
= 3 i4/9 - 3 = 4/9
j) 4,5 * 5i5/9 + 6,4 *3/8 = 45/10 * 50/9 + 64/10 * 3/8 = 5/1 * 5/1 + 8/10*3/1= 25/1 + 24/10 = 25 + 2 i4/10 = 27 i 4/10 = 27,4