Matematică, întrebare adresată de 19koyabe, 9 ani în urmă

efectueaza:model...1004×1003+2×1004-1005×1002=1004×(1003+2)-1005×1002=1004×1005×1002=1005×(1004-1002)=1005×2=2010......a)7×8+2×7+9×10.b)37×28+42×37-42×15..c)207×28+207×180-208×206..d)3009×3008-3008×3007-2×3006..e)5010×5009+5009-5011×5008 f)2016×2015+2×2016-2017×2015

Răspunsuri la întrebare

Răspuns de primăvară2017
28
a)
7×8+2×7+9×10=
7×(8+2)+9×10=
7×10+9×10=
10×(7+9)=
10×16=
160


b)
37×28+42×37-42×15=
37×(28+42)-42×15=
37×70-42×15=
2 590-630=
1 960


c)
207×28+207×180-208×206=
207×(28+180)-208×206=
207×208-208×206=
208×(207-206)=
208×1=
208


d)
3009×3008-3008×3007-2×3006=
3008×(3009-3007)-2×3006=
3008×2-2×3006=
2×(3008-3006)=
2×2=
4


e)
5010×5009+5009-5011×5008=
5009×(5010+1)-5011×5008=
5009×5011-5011×5008=
5011×(5009-5008)=
5011×1=
5011


f)
2016×2015+2×2016-2017×2015=
2016×(2015+2)-2017×2015=
2016×2017-2017×2015=
2017×(2016-2015)=
2017×1=
2017
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