a) (1419 - 1418 ) : ( 145 . 1412 ) b) ( 241 + 38 ) . ( 107 - 27 ) . (24 - 42 )
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g) (15 + 37) + (52 – 37 – 17) = 15 + 37 + 52 – 37 – 17 = 15 + 52 – 17 = 50 h) (38 – 42 +14) - (38 – 42 - 15) = 38 – 42 +14 - 38 + 42 + 15 = 14 + 15 = 29 i) (27 + 65 ) + (346 - 27- 65) = 27 + 65 + 346 - 27- 65 = 346 k) - (27 + 65) - (346 – 27 - 65) = -27 - 65 - 346 + 27 + 65 = -346 l) (42 – 69 + 17) - (42 + 17) = 42 – 69 + 17 - 42 - 17 = – 69 m) 24. (16 - 5) – 16. (24 – 5 ) = 24. 16 - 24 . 5 - 16 . 24 + 16. 5 = - 24 . 5 + 16. 5 = -8 . 5 = -40 n) (-12). 47 – 12 . 52 + (-12) = -12 (47 - 52 + 1) = -12 . (-4) = 48 p) 51 . (69 - 25) – 69. (51 - 25) = 51 . 69 - 51 . 25 – 69. 51 + 69. 25 = - 51 . 25 + 69. 25 = (- 51+ 69).25 = 450 |
a) 17.(-183)+17.83
= 17.(-183+83)
= 17.100=1700
b) (-27).145+27.45
= 27.(-145)+27.45
= 27.(-145+45)
= 27.100=2700
c) -38.(25-4)+25.(-4+38)
= -38.25-(-38).4+25.(-4)+25.38
= -38.25+25.38+38.4+25.(-4)
= 0+38.4+(-25).4
= 4.(-25+38)
= 4.13=52
d) 23.(145-17)-145.(23-37)
= (23.145-23.17)-(145.23+145.37)
= [23.(145-17)]-[145.(23+37)]
= (23.128)-(145.60)
= 2944-8700=-5756
a: \(=47-\left[\left(45\cdot16-25\cdot12\right):14\right]\)
\(=47-30=17\)
b: \(=50-\left[6+34\right]\)
=50-40
=10
a)(−24).17+(−35).24+(−24).48
=(−24).17+35.(-24)+(−24).48
= (-24). (17+35+48)
=(-24) . 100
= -2400
b)145+(27−145)−100+27
=145+27−145−100+27
=(145-145)+(27+27) -100
=0 + 54 - 100
=-46
chia từng câu ra rồi mình giải cho nhé , nhiều câu quá
a) (-37)+14+26+37 = ( -37 + 37) + ( 14 + 26) = 40
b) (-24)+6+10+24 = ( - 24 + 24) + ( 6 + 10) = 16
c) 15+23+9-25)+(-33) = (15 - 25) + ( 23 - 33) + 9
= - 10 - 10 + 9
= - 11
d) 60+33+(-50)+(-33) = ( 60 -50) + ( 33 - 33)
= 10
e) (-16)+(-209)+(-14)+209 = ( - 16 - 14) + ( - 209 + 209)
= - 30
g) (-12)+(-13)+36+(-11)= ( - 11 -12 - 13 ) + 36
= - 36 + 36 = 0
h) -16+24+16-34 = ( - 16 + 16)+(24 - 34) = - 10
r) 25+37-48-25-37 = (25 - 25)+(37 - 37) - 48 = - 48
u) 2575+37-2576-29 = ( 2575 - 2576) + ( 37 - 29)
= - 1 + 8 = 7
i) 34+35+36+37-14-15-16-17 = ( 34 - 14 )+(35 - 15)+(36-16)+ (37 - 17)
= 80
2 . Bỏ ngoặc rồi tính
a)-7264+(1543+7264) = - 7264 + 1543 + 7264
= 1543
b) (144-97)-144 = 144 - 97 - 144 = - 97
c) (-145)-(18-145) = - 145 - 18 + 145 = - 18
d) 11+(-11+27) = 11 - 11 + 27 = 27
e) (27+514)-(486-73) = 27 + 514 - 486 + 73
= 128
g) (36+79)+(145-79-66) = 36 + 79 + 145 - 79 - 66
= 115
h) 10-[12-(-9-1) = 10 - ( 12 + 9 + 1)
= 10 - 22
= - 12
r) (-28-29+43)-(43+38) = - 28 - 29 + 43 - 43 - 38
= - 95
u ) 271 - [(-43)+271-(-17)] = 271 + 43 - 271 - 17 = 26
i ) -144-[29-(+144)-(+144) = - 144 - 29 - 144 + 144 = -173
Bài 1:
a) −x + 8 = −17
−x = −17 − 8
−x = −25
⇒ x = 25
Vậy x = 25
b) 35 − x = 37
x = 35 − 37
x = −2
Vậy x = −2
c) x − 45 = −17
x = −17 + 45
x = 28
Vậy x = 28
d) |x + 1| = 20 (>0)
TH1: x + 1 = 20 TH2: x + 1 = −20
x = 20 − 1 x = −20 − 1
x = 19 x = −21
Vậy x∈\(\left\{-21;19\right\}\)
e) |x − 3| − 16 = −4
|x − 3| = −4 + 16
|x − 3| = 12 (>0)
TH1: x − 3 = 12 TH2: x − 3 = −12
x = 12+3 x = −12 + 3
x = 15 x = −9
Vậy x∈\(\left\{-9;15\right\}\)
c n m to ớp s á
áuơánààyái
a)
\(\left(14^{19}-14^{18}\right)\div\left(14^5\times14^{12}\right)\)
\(=\left(14^{19}-14^{18}\right)\div14^{17}\)
\(=\left(14^{19}-14^{18}\right)\times\dfrac{1}{14^{17}}\)
\(=\dfrac{14^{19}-14^{18}}{14^{17}}=\dfrac{14^{18}\times\left(14-1\right)}{14^{17}}\)
\(=14\times13=182\)
b)
\(\left(2^{41}+3^8\right)\times\left(10^7-2^7\right)\times\left(2^4-4^2\right)\)
\(=\left(2^{41}+3^8\right)\times\left(10^7-2^7\right)\times\left(2^4-2^4\right)\)
\(=\left(2^{41}+3^8\right)\times\left(10^7-2^7\right)\times0\)
\(=0\)