tính nhanh
156-(35:x+3).19=13
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Bài 1:tính
a)65.(-19)+19.(-35)
=65.(-19)+(-19).35
=(-19).(65+35)
=(-19).100
=-1900
b)85.(35-27)-35.(85-27)
=85.35-85.27-35.85+35.27
=(85.35-35.85)+(-85.27+35.27)
=27.(-85+35)
=27.(-50)
=1350
c)47.(45-15)-47.(45+15)
=47.[(45-15)-(45+15)]
=47.[30-60]
=47.(-30)
=-1410
Bài2: Tìm các số nguyên x biết
a)(-2).(x+6)+6.(x-10)=8
-2x-12+6x-60=8
4x-72=8
4x=72+8
4x=50
x=\(\frac{25}{2}\)
b)(-4).(2x+9)-(-8x+3)-(x+13)=0
-6x-36+8x-3-x-13=0
x-41=0
x=41
Bài 1: Tính
a) \(65.\left(-19\right)+19.\left(-35\right)\)
= \(-1235+-665\)
= \(-1900\)
b) \(85.\left(35-27\right)-35.\left(85-27\right)\)
= \(-1350\)
c) \(47.\left(45-15\right)-47.\left(45+15\right)\)
=\(-1410\)
Bài 2: Tìm x:
\(\left(-2\right).\left(x+6\right)+6.\left(x-10\right)=8\)
\(x=20\)
\(165-\left(35:x+3\right).19=13\)
\(\Rightarrow\left(35:x+3\right).19=165-13\)
\(\Rightarrow\left(35:x+3\right).19=152\)
\(\Rightarrow35:x+3=152:19\)
\(\Rightarrow35:x+3=8\)
\(\Rightarrow35:x=5\Rightarrow x=7\)
(35*x+3)*19=165-13
(35*x+3)*19=152
35*x+3=152/19
35*x+3=8
35*x=8-3
35*x=5
x=35/5
x=7
\(a.13.\left(78+22\right)=13.100=1300\)
\(b.25.70+28.25+25.2=25.\left(70+28+2\right)=25.100=2500\)
\(c.\dfrac{15.3.14.2.19}{19.14.15}=6\)
\(d.\dfrac{132.70.60}{12.35.20}=\dfrac{11.12.35.2.20.3}{12.35.20}=66\)
Đáp án là A
Ta có: 165 - (35:x + 3).19 = 13
⇔ (35:x + 3).19 = 165 - 13
⇔ (35:x + 3).19 = 152
⇔ (35:x + 3) = 152:19 = 8
⇔ 35:x = 5
⇔ x = 7
165 - (35 : x + 3). 19 = 13
(35 : x + 3). 19 =165-13
(35 : x + 3). 19 =152
35:x+3= 152:19
35:x+3=8
35: x= 8-3
35:x= 5
x= 35:5
x= 7
Vậy..
\(165-\left(35:x+3\right).19=13\)
\(\Rightarrow\left(35:x+3\right).19=165-13\)
\(\Rightarrow\left(35:x+3\right).19=152\)
\(\Rightarrow\left(35:x+3\right)=152:19\)
\(\Rightarrow\left(35:x+3\right)=8\)
\(\Rightarrow35:x=8-3\)
\(\Rightarrow35:x=5\)
\(\Rightarrow x=35:5\)
\(\Rightarrow x=7\)
Vậy x = 7
sai đề :>>>
\(165-\left(35:x+3\right)19=13\)'
\(\Leftrightarrow\left(35:x+3\right)19=165-13=152\)
\(\Leftrightarrow35:x+3=152:19=8\)
\(\Leftrightarrow35:x=8-3=5\)
\(\Leftrightarrow x=35:5\Leftrightarrow x=7\)