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a: (-14)+(-16)+24
=-14-16+24
=-30+24
=-6
b: |-25|x71+29x25
\(=25\cdot71+25\cdot29\)
\(=25\left(71+29\right)=25\cdot100=2500\)
c: \(=132:\left(41+28-5^2\right)\)
\(=132:\left(69-25\right)=132:44=3\)
Giải;
1) \(347.222-222.\left(216+184\right):8\)
\(=347.222-222.400:8\)
\(=347.222-222.50\)
\(=222.\left(347-50\right)\)
\(=222.297\)
\(=65934\)
2) \(132-\left[116-\left(132-128\right).22\right]\)
\(=132-\left[116-4.22\right]\)
\(=132-\left[116-88\right]\)
\(=132-28\)
\(=104\)
3) \(16:\left\{400:\left[200-\left(37+46.3\right)\right]\right\}\)
\(=16:\left\{400:\left[200-\left(37+138\right)\right]\right\}\)
\(=16:\left\{400:\left[200-175\right]\right\}\)
\(=16:\left\{400:25\right\}\)
\(=16:16\)
\(=1\)
4) \(\left\{184:\left[96-124:31\right]-2\right\}.3651\)
\(=\left\{184:\left[96-4\right]-2\right\}.3651\)
\(=\left\{184:92-2\right\}.3651\)
\(=\left\{2-2\right\}.3651\)
\(=0.3651\)
\(=0\)
5) \(46-\left[\left(16+71.4\right):15\right]-2\)
\(=46-\left[\left(16+284\right):15\right]-2\)
\(=46-\left[300:15\right]-2\)
\(=46-20-2\)
\(=24\)
6) \(3^3.18+72.4^2-41.18\)
\(=18.\left(27-41\right)+72.16\)
\(=18.-14+1152\)
\(=-252+1152\)
\(=900\)
Giải: (tiếp)
7) \(\left(56.46-25.23\right):23\)
\(=\left(2576-575\right):23\)
\(=2001:23\)
\(=87\)
8) \(\left(28.54+56.36\right):21:2\)
\(=\left(1512+2016\right):21:2\)
\(=3528:21:2\)
\(=84\)
9) \(\left(76.34-19.64\right):\left(38.9\right)\)
\(=\left(2584-1216\right):342\)
\(=1368:342\)
\(=4\)
10) \(\left(2+4+6+...+100\right).\left(36.333-108.111\right)\)
\(=\left(2+4+6+...+100\right).\left(11988-11988\right)\)
\(=\left(2+4+6+...+100\right).0\)
\(=0\)
11) \(\left(5.4^{11}-3.16^5\right):4^{10}\)
\(=5.4^{11}:4^{10}-3.16^5:4^{10}\)
\(=5.4-3.1\)
\(=20-3\)
\(=17\)
12) \(7256.4375-725:3650+4375.7255\)
\(=4375.\left(7256+7255\right)-\dfrac{29}{146}\)
\(=4375.14511-\dfrac{29}{146}\)
\(=63485624,8\)
Câu 12 ko chắc!
a) 2/9 - (1/20 + 2/9)
= 2/9 - 1/20 - 2/9
= (2/9 - 2/9) - 1/20
= 0 - 1/20
= -1/20
b) -3/14 + 2/13 + (-25/14) + (-15/13)
= (-3/14 - 25/14) + (2/13 - 15/13)
= -2 - 1
= -3
c) -3/11 + 11/8 - 3/8 + (-8/11)
= (-3/11 - 8/11) + (11/8 - 3/8)
= -1 + 1
= 0
d) 3/8 + (-1/4) - (7/12 - 1/6)
= 1/8 - 5/12
= -7/24
e) (1/3 + 12/67 + 13/41) - (79/67 - 28/41)
= 1/3 + 12/67 + 13/41 - 79/67 + 28/41
= 1/3 + (12/67 - 79/67) + (13/41 + 28/41)
= 1/3 - 1 + 1
= 1/3
Đáp án:
a, 38+41+117+159+6238+41+117+159+62
=(38+62)+(41+159)+117=(38+62)+(41+159)+117
=100 +200 +117=100 +200 +117
=417=417
b, 73+86+968+914+303273+86+968+914+3032
=73+(86+914)+(968+3032)=73+(86+914)+(968+3032)
=73+1000 +4000=73+1000 +4000
=5073=5073
c, 341.67+341.16+659.83341.67+341.16+659.83
=341.(67+16)+659.83=341.(67+16)+659.83
=341.83+659.83=341.83+659.83
=83.(341+659)=83.(341+659)
=83.1000=83000=83.1000=83000
d, 42.53+47.156−47.11442.53+47.156-47.114
=42.53+47.(156−114)=42.53+47.(156-114)
=42.53 +47.42=42.53 +47.42
=42.(53+47)=42.100=42.(53+47)=42.100
=4200=4200
e, 563.23+23.26+23563.23+23.26+23
=23.(563+26+1)=23.(563+26+1)
=23.600=23.600
=13800=13800
f, 132+157+43+68132+157+43+68
=(132+68)+(157+43)=(132+68)+(157+43)
=200 +200=400=200 +200=400
g, 49.68+100.34+6849.68+100.34+68
=49.68+50.68+68=49.68+50.68+68
=68.(49+50+1)=68.(49+50+1)
=68.100=6800=68.100=6800
h, 491.(267+53)+491.(151+67)491.(267+53)+491.(151+67)
=491.(267+53+151+67)=491.(267+53+151+67)
=491.538=491.538
=264158=264158
Vote mk nha.
\(132\div\left\{41+\left[28-\left(-67\right)-62)^2\right]\right\}\)
\(\Rightarrow132\div\left\{41+\left[28-\left(-129^2\right)\right]\right\}\)
\(\Rightarrow132\div\left\{41+\left[28-16641\right]\right\}\)
\(\Rightarrow132\div\left\{\text{41+16613}\right\}\)
\(\Rightarrow132\div16654\)
\(\Rightarrow\frac{6}{757}\)
Bài 1: Thực hiện các phép tính sau:
\(a)\)Chưa rỏ đề
\(b)\)\(5025\div5-25\div5\)
\(=\)\(1005-5\)
\(=\)\(1000\)
\(c)\)\(218-180\div2\div9\)
\(=\)\(218-10\)
\(=\)\(208\)
\(d)\)\(\left(328-8\right)\div32\)
\(=\)\(320\div32\)
\(=\)\(10\)
Bài 1:
a) ( Tôi không nhìn rõ đầu bài )
b) 5025 : 5 - 25 : 5
= ( 5025 - 25 ) : 5
= 5000 : 5
= 1000
c) 218 - 180 : 2 : 9
= 218 - 180 : ( 2 . 9 )
= 218 - 180 : 18
= 218 - 10
= 208
d) ( 328 - 8 ) : 32
= 320 : 32
= 10
a: =-12/20+5/20-6/20
=-13/20
b: =10/50-45/50-14/50
=-49/50
c: =31/23-7/32-8/23=1-7/32=25/32
1] giá trị tuyệt đối của - 41 +giá trị tuyệt đối của - 45=41+45=86
2] giá trị tuyệt đối của - 72 -giá trị tuyệt đối của 34=72-34=38