1, Thực hiện phép tính :
a) \(\left(-37\right)+4\cdot\left|-6\right|\)
\(=-\left(37\right)+4\cdot6\)
\(=-37+24\)
\(=13\)
b) \(17\cdot85+15\cdot17-120\)
\(=17\cdot\left(85+15\right)-120\)
\(=17\cdot100-120\)
\(=1700-120\)
\(=1580\)
2, Tìm x :
a) \(x-12=-20\)
\(x=-20+12\)
\(x=8\)
b) \(2014\cdot\left(x-12\right)=0\)
\(\Rightarrow\text{ }x-12=0\)
\(x=0+12\)
\(x=12\)
B1 : a) \(\left(-37\right)+4|-6|\)
\(=\left(-37\right)+24\)
\(=-13\)
b) 17 . 85 + 15 . 17 - 120
= 17 . ( 85 + 15 ) - 120
= 17 . 100 - 120
= 1700 - 120
= 1580
B2 : a) x - 12 = - 20
x = - 20 + 12
x = - 8
b) 2014( x - 12 ) = 0
x - 12 = 0 : 2014
x - 12 = 2014
x = 2014 + 12
x = 2026
a)\(-37+4\cdot|-6|=-37+4\cdot6\)
\(=-37+24\)
\(=-13\)
b)\(\text{17*85+15*17-120=17*(85+15)-120}\)
\(=17\cdot100-120\)
\(=1700-120\)
\(=1580\)
2.
a)\(x-12=-20\)
\(x=-20+12\)
\(x=-8\)
b)\(2014\left(x-12\right)=0\)
\(x-12=0\)
\(x=12\)
hok tốt