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a) 6,3 + (-3,7) + 2,4 + (-0,3)
= (6,3 + 2,4) + [-3,7 + (-0,3)]
= 8,7 + (-4)
= 4,7
b) (-4,9) + 5,5 + 4,9 + (-5,5)
= (-4,9 + 4,9) + [5,5 + (-5,5)]
= 0 + 0
= 0
c) 2,9 + 3,7 + (-4,2) + (-2,9) + 4,2
= [2,9 + (-2,9)] + (-4,2 + 4,2) + 3,7
= 0 + 0 + 3,7
= 3,7
d) (-6,5) . 2,8 + 2,8 . (-3,5)
= 2,8 . [-6,5 + (-3,5)]
= 2,8 . (-10)
= -28.
a, \(6,3+\left(-3,7\right)+2,4+\left(-0,3\right)\)
\(=\left(6,3-0,3\right)+\left(-3,7+2,4\right)\)
\(=6-1,3=4,7\)
b, \(\left(-4,9\right)+5,5+4,9+\left(-5,5\right)\)
\(=\left(-4,9+4,9\right)+\left(5,5-5,5\right)\)
\(=0+0=0\)
Chúc bạn học tốt!!!
a, 6.3+(-3.7)+2.4+(-0.3) = (6,3 - 0,3) + (-3,7+2,4) = 6 - 1,3 = 4,7
b, (-4.9)+5.5+4.9+(-5.5) = (-4,9 +4,9) + (-5,5 + 5,5) = 0 + 0 = 0
Xét \(\Delta ANB \) và \(\Delta BMA\) có:
AN=BM (gt)
\(\widehat {BAN} = \widehat {ABM}\) (gt)
AB chung
=>\(\Delta ANB = \Delta BMA\)(c.g.c)
=> \(\widehat{ABN} = \widehat{BAM}\) (2 góc tương ứng)
\(=\dfrac{3^5\cdot2^5\cdot3^6}{2^6\cdot3^{10}}-\dfrac{1}{2}=\dfrac{3}{2}-\dfrac{1}{2}=1\)
\(\frac{2.5^{22}-9.5^{21}}{25^{10}}:\frac{5\left(3.7^{15}-19.7^{14}\right)}{7^{16}+3.7^{15}}=5:\frac{1}{7}=35\)
\(=\left(3,7+6,3\right)-10+4,78=10-10+4,78=4,78\)