tính hợp lý:
\(\left(10^2+11^2+12^2\right):\left(13^2+14^2\right)\)
\(\text{Thực hiện các phép tính sau một cách hợp lý:}\)
\(a\)) \(\left(10^2+11^2+12^2\right):\left(13^2+14^2\right)\)
\(b\)) \(1.2.3...9-1.2.3...8-1.2.3...7.8^2\)
\(c\)) \(\dfrac{\left(3.4.2^{16}\right)^2}{11.2^{13}.4^{11}-16^9}\)
\(d\)) \(1152-\left(374+1152\right)+\left(-65+374\right)\)
\(e\)) \(13-12+11+10-9+8-7-6+5-4+3+2-1\)
Tính:
\(\left(10^2+11^2+12^2\right):\left(13^2+14^2\right)\)
\(\dfrac{10^2+11^2+12^2}{13^2+14^2}=\dfrac{100+121+144}{169+196}\)
\(=\dfrac{365}{365}=1\)
1. tính hợp lí
\(\left(10^2+11^2+12^2\right):\left(13^2+14^2\right)\)
\(\left(10^2+11^2+12^2\right):\left(13^2+14^2\right)\)
\(=\left(100+121+144\right):\left(169+196\right)\)
\(=365:365\)
\(=1\)
Tính giá trị của biểu thức: \(D=\left(10^2+11^2+12^2\right):\left(13^2+14^2\right)\)
HELP ME!
D=(102+112+122):(132+142)
D =(100+121+144) / (169+196)
D =365 / 365
D = 1
sửa lại :
D=(102+112+122) : (32+142)
D =(100+121+144) / (169+196)
D =365 / 365
D = 1
sửa lại :
D=(102+112+122) : (132+142)
D =(100+121+144) / (169+196)
D =365 / 365
D = 1
Tính hợp lý:
\(A=\dfrac{7}{12}+\dfrac{5}{12}:6-\dfrac{11}{36}\) \(B=\left(\dfrac{4}{5}+\dfrac{1}{2}\right):\left(\dfrac{3}{13}-\dfrac{8}{13}\right)\)
\(C=\left(\dfrac{2}{3}-\dfrac{1}{4}+\dfrac{5}{11}\right):\left(\dfrac{5}{12}+1-\dfrac{7}{11}\right)\)
a: \(A=\dfrac{7}{12}+\dfrac{5}{72}-\dfrac{11}{36}=\dfrac{42}{72}+\dfrac{5}{72}-\dfrac{22}{72}=\dfrac{25}{72}\)
b: \(B=\dfrac{8+5}{10}:\dfrac{-5}{13}=\dfrac{13}{10}\cdot\dfrac{13}{-5}=-\dfrac{169}{100}\)
c: \(C=\left(\dfrac{88}{132}-\dfrac{33}{132}+\dfrac{60}{132}\right):\left(\dfrac{55}{132}+\dfrac{132}{132}-\dfrac{84}{132}\right)\)
\(=\dfrac{88-33+60}{55+132-84}=\dfrac{115}{103}\)
Tính
\(\left(10^2+11^2+12^2\right):\left(13^2+14^2\right)\)
(102 +112+122):(132 +142)
=(100+121+144):(169+196)
=365:365
=1
thực hiện các phép tính sau một cách hợp lí:
a,\(\left(10^2+11^2+12^2\right):\left(13^2+14^2\right)\)
b,\(1.2.3...9-1.2.3...8-1.2.3...7.8^2\)
c,\(\frac{\left(3.4.2^{16}\right)^2}{11.2^{13}.4^{11}-16^9}\)
d,1152-(374+1152)+(-65+374)
e,13-12+11+10-9+8-7-6+5-4+3-2-1
a) =\(\left[\left(12+1\right)^2+\left(12+2\right)^2\right]:\left(13^2+14^2\right)\)
=1
b)=(1.2.3....8).(9-1-8)
=(1.2.3....8).0
=0
mik chỉ giải được zậy thôi.
t mik nha.
Tính hợp lí:
a, \(\left(10^2+11^2+12^2\right):\left(13^2+14^2\right)\)
b, \(1.2.3...9-1.2.3...8-1.2.3...8^2\)
a,(10^2+11^2+12^2):(13^2+14^2)
=(100+121+144);(169+196)
=365:365
=1
b,1.2.3...9-1.2.3...8-1.2.3...8^2=0
a)=(100+121+144):(169+196)=365:365=1
b)=1.2.3...8.(9-1-8)=1.2.3...8.0=0
k mk nhaa
\(\left(10^2+11^2+12^2\right):\left(13^2+14^2\right)\)
\(\left(10^2+11^2+12^2\right):\left(13^2+14^2\right)\)
\(=\left(100+121+144\right):\left(169+196\right)\)
\(=\frac{365}{365}=1\)
(102 + 112 + 122) : (132 + 142)
= (100 + 121 + 144) : (169 + 196)
= 365 : 365
= 1
Ủng hộ mk nha ^_-
(102 + 112 + 122) : (132 + 142)
= (100 + 121 + 144) : (169 + 196)
= 365 : 365
= 1