\(125-\left(-75\right)+32-\left(48+32\right)\)

\(=125-\left(-75\right)+32-80\)

\(=125+75+32-80\)

\(=200+32-80\)

\(=232-80\)

\(=152\)

\(-63+415-37-115\)

\(=352-57-115\)

\(=315-115\)

\(=200\)

\(13.\left(-2\right)^2+37.4+4.\left(-150\right)\)

\(=13.2^2+37.4+4.-150\)

\(=13.4+37.4+4.-150\)

\(=4.\left(13+37+-150\right)\)

\(=4.-100\)

\(=-400\)

\(-15.x+4=79\)

\(\Leftrightarrow-15.x=79-4\)

\(\Leftrightarrow-15.x=75\)

\(\Leftrightarrow x=75:-15\)

\(\Leftrightarrow x=-5\)

Vậy \(x=-5\)

\(15-\left(2+x\right)=23\)

\(\Leftrightarrow2+x=15-23\)

\(\Leftrightarrow2+x=-8\)

\(\Leftrightarrow x=-8-2\)

\(\Leftrightarrow x=-10\)
Vậy \(x=-10\)

\(\left(x+2\right)\left(x^2-1\right)=0\)

\(\Leftrightarrow\left(x+2\right)\left(x^2-1^2\right)=0\)

\(\Leftrightarrow\left(x+2\right)\left(x+1\right)\left(x-1\right)=0\)

\(\Leftrightarrow\left(x+1\right)\left(x-1\right)=0\)

\(\Leftrightarrow x=\pm1\)

Vậy \(x\in\left\{\pm1\right\}\)

\(56:\left|x-4\right|=7\)

\(\Leftrightarrow\left|x-4\right|=56:7\)

\(\Leftrightarrow\left|x-4\right|=8\)

\(\Leftrightarrow\orbr{\begin{cases}x-4=8\\x-4=-8\end{cases}\Leftrightarrow\orbr{\begin{cases}x=8+4\\x=-8+4\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=12\\x=-4\end{cases}}}\)

Vậy \(x\in\left\{12;-4\right\}\)

\(a.\left(-83\right)+302+83\\ =\left(-83+83\right)+302\\ =0+302\\ =302\\ b.14.\left(-7\right)-216:2\\ =-98-108\\ =-206\\ c.56.\left(-32\right)+\left(-68\right).56\\ =56.\left[\left(-32\right)+\left(-68\right)\right]\\ =57.\left(-100\right)\\ =-5700\\ d.2^3-6.\left[25-\left(33-28\right)^2\right]\\ =8-6\left[25-5^2\right]\\ =8-6\left[25-25\right]\\ =8-6.0\\ =8-0\\ =8\\ e.15.\left(-6\right)-420:\left(-4\right)\\ =-90-\left(-105\right)\\ =-90+105\\ =15\)

\(f.63.\left(-52\right)+\left(-48\right).63\\ =63.\left[\left(-52\right)+\left(-48\right)\right]\\ =63.\left(-100\right)\\ =-6300\)

1) = 0 + 10 - 50 = -40

2) = 0 + 71 + 15 = 86

3) = 0 + 71 + 18 = 89

4) = 30 - 0 - 85 = -55

1) $(-81)\cdot27-3^4\cdot(-77)$

$=(-81)\cdot27-81\cdot(-77)$

$=-81\cdot[27+(-77)]$

$=-81\cdot(27-77)$

$=-81\cdot(-50)$

$=81\cdot50$

$=4050$

2) $(-16)\cdot32-(-4)^2\cdot18$

$=(-16)\cdot32-16\cdot18$

$=-16\cdot(32+18)$

$=-16\cdot50$

$=-800$

3) $(-2)^4\cdot289-16\cdot189$

$=16\cdot289+16\cdot(-189)$

$=16\cdot[289+(-189)]$

$=16\cdot(289-189)$

$=16\cdot100$

$=1600$

4) $41\cdot(-18)+41\cdot(-81)-41$

$=1\cdot(-18)+41\cdot(-81)+41\cdot(-1)$

$=41\cdot[(-18)+(-81)+(-1)]$

$=41\cdot(-18-81-1)$

$=41\cdot(-99-1)$

$=41\cdot(-100)$

$=-4100$

5) $17\cdot(-37)-23\cdot37-46\cdot(-37)$

$=17\cdot(-37)+23\cdot(-37)-46\cdot(-37)$

$=-37\cdot(17+23-46)$

$=-37\cdot(40-46)$

$=-37\cdot(-6)$

$=37\cdot6$

$=222$

6) $-48+48\cdot(-78)+48\cdot(-21)$

$=48\cdot(-1)+48\cdot(-78)+48\cdot(-21)$

$=48\cdot[(-1)+(-78)+(-21)]$

$=48\cdot(-1-78-21)$

$=48\cdot(-79-21)$

$=48\cdot(-100)$

$=-4800$

7) $29\cdot(-13)+27\cdot(-29)+(-14)\cdot(-29)$

$=-29\cdot13+27\cdot(-29)+(-14)\cdot(-29)$

$=-29\cdot[13+27+(-14)]$

$=-29\cdot(40-14)$

$=-29\cdot26$

$=-754$

$\text{#}Toru$

Đáp Án

a)52:4x3+2x52

=13x3+2x52

=39+104

=143

b)5x42-18:32

=100-0.5625

=99.4375

của bạn nha

d) -37 . (-19) + 37 . (-119)

= -37.(-19 + 119)

= -37 . 100

= -3700

1a) -54 . 76 + 12 .(-76) + 76.(-34)

= (-54 - 12 - 34).76

= -100 . 76

= -176

b) 37.(63 - 24) - 63.(24 + 37)

= 37 . 63 - 37 . 24 - 63.24 - 63 . 37

= (37.63 - 63.37) - (37 + 63) . 24

= 0 - 100 . 24

= - 2400

2a) x + (-27) = -23 - x

=> x + x = -23 + 27

=> 2x = 4

=> x = 4 : 2

=> x = 2

b) xy + 2x - y = 15

=> x(y + 2) - y = 15

=> x(y + 2) - (y + 2) = 13

=> (x - 1)(y + 2) = 13 = 1 . 13 = 13 . 1

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