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\(-77.113+45.23+77.158\)
\(=-77\left(113-158\right)+45.23\)
\(=-77.\left(-45\right)+45.23\)
\(=-45\left(-77-23\right)\)
\(=-45.\left(-100\right)\)
\(=4500\)
\(A=-77.113+45.23+77.158\)
\(=-77.113+45.23-\left(-77\right).158\)
\(=-77\left(113-158\right)+45.23\)
\(=-77.\left(-45\right)+45.23\)
\(=-77.\left(-45\right)-\left(-45\right).23\)
\(=-45\left(-77-23\right)\)
\(=-45.\left(-100\right)\)
\(=4500\)
Bài 5:
a: x(x-4)=0
=>\(\left[{}\begin{matrix}x=0\\x-4=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=4\end{matrix}\right.\)
b: Đề thiếu vế phải rồi bạn
Bài 6:
a: \(\left(-5\right)\cdot\left(-6\right)\cdot\left(-4\right)\cdot2\)
\(=-\left(2\cdot5\right)\cdot\left(4\cdot6\right)\)
\(=-24\cdot10=-240\)
b: \(\left(-3\right)\cdot2\cdot\left(-8\right)\cdot5\)
\(=3\cdot2\cdot8\cdot5\)
\(=\left(3\cdot8\right)\cdot\left(2\cdot5\right)\)
\(=24\cdot10=240\)
a: \(56\cdot125=56\cdot100+56\cdot25=5600+1400=7000\)
b: \(13\cdot12=\left(10+3\right)\cdot12=120+36=156\)
c: \(39\cdot101=39\cdot100+39=3939\)
d: \(12\cdot53+53\cdot172-53\cdot84\)
=53(12+172-84)
=53*100
=5300
e: \(5\cdot7\cdot77-7\cdot60+49\cdot25-15\cdot42\)
\(=5\cdot7\left(77+7\cdot5\right)-420-630\)
\(=35\cdot112-1050=2870\)
\(a,21-22+23-24=-1+\left(-1\right)=-2\\ b,125-\left(115-99\right)=125-115+99=10+99=109\)
a) 21 - 22 + 23 - 24
= (21 + 23) + (-22 - 24)
= 44 - 46
= -2
b) 125 - (115 - 99)
= 125 - 115 + 99
= 10 + 99
= 109
a)(−2023).33+2023.(−68)+2023�)(-2023).33+2023.(-68)+2023
=2023.(−33−68+1)=2023.(-33-68+1)
=2023.(−100)=2023.(-100)
=−202300=-202300
b)(38−29+43)−(43+38)�)(38-29+43)-(43+38)
=38−29+43−43−38=38-29+43-43-38
=(38−38)−29+(43−43)=(38-38)-29+(43-43)
=−29=-29
=−29=-29
a: =3/4-19/18-3/4
=-19/18
b: =24-24x47-24x54
=24(1-47-54)
=24x(-100)=-2400
A= -77.113+45.23+77.158
A= 77.-113+45.23+77.158
A= 77(-113+158)+45.23
A= 77.45+45.23
A= 45(77+23)
A= 45.100
A= 4500
Ta có: \(-77\cdot113+45\cdot23+77\cdot158\)
\(=-77\left(113-158\right)+45\cdot23\)
\(=77\cdot45+23\cdot45\)
=4500