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a) 5 9 . 7 13 + 5 9 . 9 13 − 5 9 . 3 13 = 5 9 7 13 + 9 13 − 3 13 = 5 9
b) 4 19 . − 3 7 + − 3 7 . 15 19 + 5 7 = − 3 7 4 19 + 15 19 + 5 7 = − 3 7 + 5 7 = 2 7
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a) 7 − 3 4 5 .3 1 8 − 1 3 5 : 0 , 5 2 = 7 − 19 5 . 25 8 − 8 5 : 1 2 2 = 35 5 − 19 5 . 25 8 − 8 5 . 1 4 = 16 5 . 25 8 − 2 5 = 10 − 2 5 = 48 5 .
b) − 1 5 8 + 1,25: 1 − 9 4 = − 13 8 + 125 100 : 4 4 − 9 4 = 13 8 + 5 4 : − 5 4 = 13 8 + 5 4 . − 4 5 = 13 8 + − 1 = 5 8 .
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Câu 2:
a: x-158=32
=>x=158+32
=>x=190
b: \(x\cdot24=264\)
=>\(x=\dfrac{264}{24}\)
=>x=11
c: \(6x+9=3^7:3^4\)
=>\(6x+9=3^3\)
=>6x+9=27
=>6x=18
=>x=18/6=3
Câu 1:
a: \(86\cdot19+14\cdot19\)
\(=19\left(86+14\right)\)
\(=19\cdot100=1900\)
b: \(4\cdot\left(-5\right)^2-104\cdot\left(-5\right)^2\)
\(=4\cdot25-104\cdot25\)
\(=25\left(4-104\right)=-100\cdot25=-2500\)
c: \(7\cdot\left(-2\right)\cdot8\left(-5\right)\)
\(=7\cdot2\cdot8\cdot5\)
\(=56\cdot10=560\)
d: \(59-\left[59+\left(-76\right)\right]\)
\(=59-59+76\)
=76
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Bài 2: Tính nhanh
a) 29 + 132 + 237 + 868 + 3
= 29+(132+858)+(237+3)
=29+990+240
=1259
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\(34\times76+66\times110+34\times34\)
\(=34\times\left(76+34\right)+66\times110\)
\(=34\times110+66\times110=110\times\left(34+66\right)=110\times100=110000\)
34 x 76 + 66 x 110 + 34 x 34
= 34 x ( 76 + 34 ) + 66 x 110
= 34 x 110 + 66 x 110
= 110 x ( 34 + 66 )
= 110 x 100
= 11 000
=))
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a) -158 - (532 - 158) + 32
= -158 - 374 + 32
= -532 + 32
=-500
b) (34-419)-(34-76-419)
=- 385 -(-42-419)
=-358-(-461)
=103