Câu hỏi của Nguyễn Việt Anh

Question

Bài 2: Tính nhanh a/ A = + + + 1522 393 1478 607 e/ E = + + 38.56 7.8.45 17.56 b/ B = + + + + 251 849 759 231 141 f/ F = + + + 49.15 75.49 49.25 15.51 c/ C = + + + + 2004 2005 2006 2007 2008 g/ G = + + 12.45 9.4.19 72.83 d/ D = 75.125.32

Athanasia Karrywang · Accepted Answer

a)17.85+15.17−120a)17.85+15.17-120⇔1445+15.17−120⇔1445+15.17−120⇔1445+255−120⇔1445+255−120⇔1580⇔1580b)2³.17−2³.14b)2³.17-2³.14⇔8.17−8.14⇔8.17−8.14 ⇔136−8.14⇔136−8.14⇔24⇔24 c)20−[30−(5−1)²:2]c)20-[30-(5-1)²:2]⇔20−(30−42:2)⇔20−(30−4​2​​:2)⇔20−(30−8)⇔20−(30−8)⇔−2⇔-2d)80−(4.5²−3.2²)d)80-(4.5²-3.2²)⇔80−(4.25−3.22)⇔80−(4.25−3.2​2​​)⇔80−(100−12)⇔80−(100−12)⇔−8⇔-8e) 27.77+24.27−2727.77+24.27-27⇔ 27.77+24.27−27.1⇔ 27.77+24.27-27.1⇔27.(77+24−1)⇔27.(77+24-1)⇔27⇔27g)174:{2.[36+(4²−23)]}g)174:{2.[36+(4²-23)]}⇔ 174:{2⋅[36+(16−23)]}⇔ 174:{2⋅[36+(16−23)]}⇔174:{2⋅[36−7]}⇔174:{2⋅[36−7]}⇔ 174:{2⋅29}⇔ 174:{2⋅29}⇔ 174:58⇔ 174:58⇔ 3Câu trả lời: a)17.85+15.17−120a)17.85+15.17-120⇔1445+15.17−120⇔1445+15.17−120⇔1445+255−120⇔1445+255−120⇔1580⇔1580b)2³.17−2³.14b)2³.17-2³.14⇔8.17−8.14⇔8.17−8.14 ⇔136−8.14⇔136−8.14⇔24⇔24 c)20−[30−(5−1)²:2]c)20-[30-(5-1)²:2]⇔20−(30−42:2)⇔20−(30−4​2​​:2)⇔20−(30−8)⇔20−(30−8)⇔−2⇔-2d)80−(4.5²−3.2²)d)80-(4.5²-3.2²)⇔80−(4.25−3.22)⇔80−(4.25−3.2​2​​)⇔80−(100−12)⇔80−(100−12)⇔−8⇔-8e) 27.77+24.27−2727.77+24.27-27⇔ 27.77+24.27−27.1⇔ 27.77+24.27-27.1⇔27.(77+24−1)⇔27.(77+24-1)⇔27⇔27g)174:{2.[36+(4²−23)]}g)174:{2.[36+(4²-23)]}⇔ 174:{2⋅[36+(16−23)]}⇔ 174:{2⋅[36+(16−23)]}⇔174:{2⋅[36−7]}⇔174:{2⋅[36−7]}⇔ 174:{2⋅29}⇔ 174:{2⋅29}⇔ 174:58⇔ 174:58⇔ 3

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