53 x (13+ m )=? biết m=27
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a) `123 - 27 + 27 + 13 - 123`
`= (123 - 123) + (27 - 27) + 13`
`= 0 + 0 + 13`
`= 13`
`---`
b) `175 + 25 + 13 + 15 - 175 - 25`
`= (175-175)+(25-25)+25+13`
`=0+0+25+13`
`=28`
`---`
c) \(53\times39+47\times39+53\times21+47\times21\)
\(=\text{[}\left(53+47\right)\times39]+\left[\left(53+47\right)\times21\right]\)
\(=\left(100\times39\right)+\left(100\times21\right)\)
\(=3900+2100\)
`=6000`
`---`
d) \(49\times35+49\times16-49\times61\)
`=` \(49\times\left(35+16-61\right)\)
`=` \(49\times\left(-10\right)\)
`=-490`
a) – 3 < x < 2 => x ∈ {-2;-1;0;1}
b) − 4 21 < x 21 < 2 21 => x ∈ {-3;-2;-1;0;1}
c) 1 ≤ x ≤ 6 => x ∈ {-3;-2;-1;0;1}
d) -7 ≤ x ≤ -3 => x ∈ {-3;-2;-1;0;1}
Ta có: \(13\cdot\left(-47\right)-53\cdot13\)
\(=13\cdot\left(-47-53\right)\)
\(=13\cdot\left(-100\right)=-1300\)
Ta có: \(27\cdot\left(-67\right)+33\cdot\left(-27\right)\)
\(=27\cdot\left(-67\right)-33\cdot27\)
\(=27\left(-67-33\right)\)
\(=27\cdot\left(-100\right)=-2700\)
Ta có: \(-49\cdot65+36\cdot\left(-49\right)+49\)
\(=-49\cdot65+\left(-49\right)\cdot36+\left(-49\right)\cdot\left(-1\right)\)
\(=-49\cdot\left(65+36-1\right)\)
\(=-49\cdot100=-4900\)
Ta có: \(136\cdot\left(-47\right)+36\cdot47\)
\(=\left(-136\right)\cdot47+36\cdot47\)
\(=47\cdot\left(-136+36\right)\)
\(=47\cdot\left(-100\right)=-4700\)
Ta có: \(\left(-48\right)\cdot72+36\cdot\left(-304\right)\)
\(=-96\cdot36+36\cdot\left(-304\right)\)
\(=36\cdot\left(-96-304\right)\)
\(=36\cdot\left(-400\right)=-14400\)
4 - ( 27 - 3 ) = x - ( 13 - 4)
=> x- (13- 4)= -20
=> x- 9= -20
=> x= -20+9
=> x=-11
Vậy x= -11
Theo đề bài ta có :
4-(27-3)=x-(13-4)
=>4-27+3=x-13+4=x-7
=>-20=x-7
=>x=-20+7=-13
Vậy x=-13
\(a.\left(47\times27\right)\times\left(-13\right)+13\left(-53-27\right)\)
\(=1269\times\left(-1\right)\times13+13\left(-80\right)\)
\(=13\left(-1269\right)+13\left(-80\right)\)
\(=13\left[\left(-1269\right)+\left(-80\right)\right]\)
\(=13\left(-1349\right)\)
\(=-17537\)
\(b.-17\left(13+5\right)-13\left(-17-2\right)\)
\(=13\left(-17\right)+5\left(-17\right)-13\left(-17\right)+13.2\)
\(=0-85+26\)
\(=-59\)
53 x (13+ m ) = 53 x ( 13 + 27 ) = 53 x 40 = 2120
ơ kìa pạn Huyền sao ko nhừn mềnk :<