| –345| : | –5| + |27| . (–3)
Tính
| –345| : | –5| + |27| . (–3)
| –345| : | –5| + |27| . (–3)
➙345:5+27.(-3)=69+27.(-3)=69+-81=-12
Chúc bạn hok tốt!✔❤✔
ví dụ \(\left|-500\right|\)=500
345:5+27.(-3)
=69+(-81)
=69-81
=-12
Bài 2. Tính nhanh
a) 27 + (-2019) + (-27)
d) (-102) – (345 – 102)
b) (-10) + 23 + (-20) + 30
e) (12 + 34 – 56) – (12 – 56)
c) (-2).125.(-5).(-8).(+17) f) 37.(-345) – 345.(-47)
Bài 2. Tính nhanh
a) 27 + (-2019) + (-27)
= 27 -2019 -27
=(27 - 27) -2019
=0-2019
= -2019
d) (-102) – (345 – 102)
= -102 - 345 +102
= (102 - 102) -345
= 0-345
= -345
b) (-10) + 23 + (-20) + 30
= -10 +23-20+30
= -(10+20) +23 +30
= -30 +23 +30
= (30-30) +23
= 0 +23
= 23
e) (12 + 34 – 56) – (12 – 56)
= 12 +34 -56 -12 +56
= (12-12) + (56-56) +34
= 0+0 +34
= 34
c) (-2).125.(-5).(-8).(+17)
=[(-2) . (-5)] . [ 125.(-8)] . (+17)
= 10 . (-1000).(+17)
= - 10000 . 17
= - 170000
f) 37.(-345) – 345.(-47)
= -345 . (37-47)
= -345.(-10)
=3450
81:3² +6×2 mũ 3 - 36×3³
200+ (-2020) - [ (-2020)- (-200)]
27:3² + 2019 mũ 0 +4×5³
-- (--300) +|--780|-- (300+780--345)
1.Tính hợp lí ( nếu có thể)
a, (-243+345) - (257+ (-55) - 129)
b,(-2)3 - 45:(-3)2 – (-2019)0.(-1)2019
c, [27.(-67)+33.(-27)]:(-30)
d,(12+22+….+1002).(34-92)
e, 53.47+532-20210
i,38+(-21)+(-58)+(-6)
h,(2020+27)-[2020+(-73)]-129
g,1-3+5-7+9-11+...+2017+2019+2021
2.Thực hiện phép tính
a, 100:{250:[450-(4.53-22.25)]}
b,[(125)3.75-(-175)5]:20162017
Thực hiện phép tính :
a) ( –95). (2 – 125) – 125. 95
b) | –345| : | –5| + |27| . (–3)
a)(-95).(2-125)-125.95
=(-95).(-123)-125.95
=95.123-125.95
=95(123-125)
=95.(-2)
=-190
Thực hiện phép tính:
a) (-95).(2-125) -125.95
=(-95).2+(-95).(-125) -125.95
= -190 +95.125 -125.95
= -190 + (95.125 -95.125) = -190
b) \(|\)-345\(|\): \(|\)-5\(|\) + \(|\)27\(|\). (-3)
= 345 : 5 + 27. (-3)
= 69 - 81 = -12
a) ( –95). (2 – 125) – 125. 95
=( –95). ( –123) – 11875
=11685 – 11875
= – 190
b) | –345| : | –5| + |27| . (–3)
= 345 : 5 + 27 . (–3)
= 69 +(- 81)
= -12
a) (-10).35+10.(-12)-(-10)
b)20.(-345)+(-20).(-315)
c)25.(27-55)-27.(25-55)
d)25.(-415)+9(-15).418
e)5+(-8).3
MÌNH ĐANG CẦN GẤP NHA
a: \(\left(-10\right)\cdot35+10\cdot\left(-12\right)-\left(-10\right)\)
\(=\left(-10\right)\cdot35+\left(-10\right)\cdot12-\left(-10\right)\)
\(=-10\left(35+12-1\right)=-10\cdot46=-460\)
b: \(20\cdot\left(-345\right)+\left(-20\right)\cdot\left(-315\right)\)
\(=20\cdot\left(-345\right)+20\cdot315\)
\(=20\left(-345+315\right)=-30\cdot20=-600\)
c: \(25\left(27-55\right)-27\left(25-55\right)\)
\(=25\cdot27-25\cdot55-27\cdot25+27\cdot55\)
\(=27\cdot55-25\cdot55=2\cdot55=110\)
d: \(25\cdot\left(-415\right)+9\cdot\left(-15\right)\cdot418\)
\(=-25\cdot415-9\cdot15\cdot418\)
\(=-5\left(5\cdot415+3\cdot9\cdot418\right)\)
\(=-5\left(2075+11286\right)=-5\cdot13361=-66805\)
e: \(5+\left(-8\right)\cdot3\)
=5-24
=-19
câu 1:(-25)(75-45)-75.(45-25)
câu 2: (123+345)+(456-123)-[2456-(-345)]
câu 3: -2020-(28-2020)-192
bài 2 : tìm x
a) (27-x)+(15+x)=x-24
b)|x+15|=|3x-5|
c)(x+3)(x+5)<0
d)3x+4y-xy=16
bài 3 Không quy đồng mẫu hãy tính tổng sau
H=5/2.1+4/1.11+3/11.2+1/2.15+13/15.4
giúp mik với mik sắp phải nộp rồi!!!
( 3/17 - 2/345 + 5/12 ) - ( - 2/345 + 3/17 - 1/12 )
\(\left(\frac{3}{17}-\frac{2}{345}+\frac{5}{12}\right)-\left(-\frac{2}{345}+\frac{3}{17}-\frac{1}{12}\right)\)
\(=\frac{3}{17}-\frac{2}{345}+\frac{5}{12}+\frac{2}{345}-\frac{3}{17}+\frac{1}{12}\)
\(=\left(\frac{3}{17}-\frac{3}{17}\right)+\left(\frac{2}{345}-\frac{2}{345}\right)+\frac{5}{12}+\frac{1}{12}\)
\(=\frac{6}{12}=\frac{1}{2}\)
( 3/17 - 2/345 + 5/12 ) - ( - 2/345 + 3/17 - 1/12 )
= 3/17 - 2/345 + 5/12 + 2/345 - 3/17 + 1/12
= ( 3/17 - 3/17 ) + ( 2/345 - 2/345 ) + ( 5/12 + 1/12 )
= 0 + 0 + 1/2
=1/2
tìm x :
a) 72+x+2*7x-1=345
b) 81-2x*27x=95
a/ 72+x + 2.7x-1 =345
73 . 7x-1 + 2.7x-1 = 345
7x-1 (73+2) = 345
7x-1 . 345 = 345
7x-1 = 345 : 345 = 1
7x-1 = 70
x - 1 = 0
x = 0+1 = 1
b/ 81-2x . 27x = 95
(34)-2x . (33)x = (32)5
34.(-2x) . 33.x = 32.5
3-8x . 33x = 310
3-8x+3x = 310
3-5x = 310
-5x = 10
x = 10 : (-5) = -2