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5 . [(85 - 35 : 7) : 80 + 90] - 50
= 5 . [(85 - 5) : 80 + 90] - 50
= 5 . [80 : 80 +90] - 50
= 5 . [1 + 90] - 50
= 5 . 91 - 50
= 455 - 50 = 405
5 [ ( 85 - 35 : 7 ) : 80 + 90 ] - 50
= 5 [ ( 85 - 5 ) : 80 + 90 ] - 50
= 5 [ 80 : 80 + 90 ] - 50
= 5 [ 1 + 90 ] - 50
= 5 . 91 - 50
= 455 - 50
= 405
=))
35:7
a) \(\left(3^2-2\right).\left(x-12+35\right)\)\(=\)\(5^2+279:5\)
\(7.\left(x-12+35\right)=80,8\)
\(x-12+35=80,8:7\)
\(x-12+35=\frac{404}{35}\)
\(x-12=\frac{404}{35}-35\)
\(x-12=\frac{-821}{35}\)
\(x=\frac{-821}{35}+12\)
\(x=\frac{-401}{35}\)
b) \(260:\left(x+4\right)\)\(=\)\(5\left(2^3+5\right)-3\left(3^2+2^2\right)\)
\(260:\left(x+4\right)=26\)
\(x+4=260:26\)
\(x+4=10\)
\(x=10-4\)
\(x=6\)
c) \(7^{x-3}=343\)
\(7^x:7^3=343\)
\(7^x=343.7^3\)
\(7^x=117649\)
vì \(117649=7^6\Rightarrow x=6\)
d) \(\left(x-3\right)^{2017}=\left(x-3\right)^{2016}\)
\(\Rightarrow\hept{\begin{cases}x-3=1\\x-3=0\end{cases}\Rightarrow\hept{\begin{cases}x=4\\x=3\end{cases}}}\)
e) \(\left(2^3+3\right).\left(x-5\right)+14\)\(=\)\(5^2+124:2^2\)
\(\left(2^3+3\right).\left(x-5\right)+14=56\)
\(\left(2^3+3\right).\left(x-5\right)=56-14\)
\(\left(2^3+3\right).\left(x-5\right)=42\)
\(x-5=42:\left(2^3+3\right)\)
\(x-5=\frac{42}{11}\)
\(x=\frac{42}{11}+5\)
\(x=\frac{97}{11}\)
a) (-13) + (-750) + (-17) + 750
= -763 + (-17) + 750
= -780 + 750
= -30
b) (55 + 45 + 15) - (15 - 55 + 45)
= 115 - 5
= 110
c) (-7) + (-20) + 35 + (-8)
= -27 + 35 + (-8)
= 8 + (-8)
= 0
d) (57 - 725) - (605 - 53)
= -668 - 552
= -1220
Hok tốt, mik nha
a) \(48\cdot19+81\cdot48\)
\(=48\cdot\left(19+81\right)\)
\(=49\cdot100\)
\(=4900\)