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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
\(A=1,7+\left|3,4-x\right|\)
\(C\text{ó};\left|3,4-x\right|\)lớn hơn or =0
\(\Rightarrow\)\(1,7+\left|3,4-x\right|=1,7+0\)
\(\Rightarrow1,7+\left|3,4-x\right|=1,7\)
\(\Rightarrow\left|3,4-x\right|=0\)
\(\Rightarrow x=3,4\)
\(B=\left|x+2,8\right|-3,5\)
\(C\text{ó}:\left|x+2,8\right|\)Lớn hơn or = 0
\(\Rightarrow\left|x+2,8\right|-3,5=0-3,5\)
\(\Rightarrow\left|x+2,8\right|-3,5=-3,5\)
\(\Rightarrow\left|x+2,8\right|=0\)
\(\Rightarrow x=-2,8\)
\(C=\left|4,3-x\right|+3,7\)
\(C\text{ó}:\left|4,3-x\right|\) Lớn hơn or = 0
\(\Rightarrow\left|4,3-x\right|+3,7=0+3,7\)
\(\Rightarrow\left|4,3-x\right|+3,7=3,7\)
\(\Rightarrow\left|4,3-x\right|=0\)
\(\Rightarrow x=4,3\)
a) \(16^{^3}:8^2=\left(8.2\right)^3:8^2=8^3.2^3:8^2=\left(8^3:8^2\right).2^3=8.8=64\)
b)\(8^3.\left(0,125\right)^3=\left(8.0,125\right)^3=1^3=1\)
c)\(7^{^{200}}.\left(\frac{1}{7}\right)^{200}=\left(7.\frac{1}{7}\right)^{200}=1^{200}=1\)
d)\(4.\left(0,25\right)^3.64=4.\left(0,25\right)^3.4^3=4.\left(0,25.4\right)^3=4.1=4\)
e)....
cậu có thể tham khảo bài làm trên đây ạ, chúc cậu hok tốt ^^
A=\(2^2-9^3+4^{-2}.16-2.5^2\)
\(=4-729+1-50=-774\)
B=\(\left(2^3.2\right).\dfrac{1}{2}+3^{-2}.3^2-7.1+5\)
\(B=2^4.\dfrac{1}{2}+1-7+5=8+1-7+5=7\)
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