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a) 80- (4.52 - 3.23)
= 80- ( 208 -69 )
=80+139 quy tắc đổi dấu trừ tước dấu ngoặc
= 219
e: Ta có: \(2448:\left[119-\left(23-6\right)\right]\)
\(=2448:\left(119-23+6\right)\)
\(=2448:102=24\)
a) 80 - (4.52 - 3.23)
= 80 - 100 + 24
= 4
b) 23.75 + 25.23 + 180
= 25.(23.3 + 23) + 180
= 25.23.4 + 180
= 100.23 + 180
= 2300 + 180
= 2480
c) 2448 : [119 - (23 - 6)]
= 2448 : (119 - 17)
= 2448 : 102
= 24
a,80 - (100-24)
= 80-76
= 4
b,1725+575+180
=2300+180
=2480
c,2448 : [119-17]
=2448 : 102
= 24
mik mong bn sẽ làm đúng
123-5.(x+4)=38
5.(x+4)=123-38
5.(x+4)=85
x+4=85:5
x+4=17
x=17-4
x=13
(3.x-2^4).7^3=2.7^4
(3.x-16).343=2.2401
(3.x-16).343=4802
3.x-16=4802:343
3.x-16=14
3.x=14+16
3.x=30
x=30:3
x=10
6^2:4.3+2.5^2
=36:4.3+2.25
=9.3+2.25
=27+50
=77
5.4^2-18:3^2
=5.16-18:9
=80-2
=78
80-(4.5^2-3.2^3)
=80-(4.25-3.8)
=80-(100-24)
=80-76
=4
23.75+25.23+180
=23.(75+25)+180
=23.100+180
=2300+180
=2480
2448:[119-(23-6)]
=2448:(119-17)
=2448:102
=24
(2600+6400)-3.x=1200
9000-3.x=1200
3.x=9000-1200
3.x=7800
x=7800:3
x=2600
[(6.x-72):2-84].28=562
(6.x-72):2-84=562:28
(6.x-72):2-84=281/14
(6.x-72):2=281/14+84
(6.x-72):2=1457/14
6.x-72=1457/14.2
6.x-72=1457/7
6.x=1457/7+72
6.x=1961/7
x=1961/7:6
x=1961/42
a) 80 - (4.52 - 3.23 )
= 80 - ( 4 . 25 - 3. 8 )
= 80 - ( 100 - 24 )
= 80 - 76 = 4
b) 56 : 54 + 23 . 22 - 12017
= 52 + 25 - 1
= 25 + 32 - 1
= 57 -1 = 56
b)23.75+25.23+180
23.(75+25)+180
23.100+180
2300+180
2480
c)
-257-(-257)+100
(-257+257)+100
0+100
100
d)
-3-4+6
-3+(-4)+6
-7+6
-1
a, 80 - 4 . 5 2 - 3 . 2 3
= 80 – (4.25 – 3.8)
= 80 – 76 = 4
b, 5 6 : 5 4 + 2 3 . 2 2 - 1 2018
= 5 2 + 2 5 - 1
= 25 + 32 – 1 = 56
c, [36.4 – 4. 82 - 7 . 11 2 ]:4 – 2019 0
= (144 – 4. 5 2 ):4 – 1
= (144 – 100):4 – 1
= 11 – 1 = 10
d, 303 – 3.{[655 – (18:2+1). 4 3 +5]}: 10 0
= 303 – 3.(655 – 10.64 + 5):1
= 303 – 10 = 293
a, = 80-(4.25-3.8)
= 80 - ( 100 - 24 )
= 80 - 76
= 4
b , 23,75+25,23+180 = 48.98 + 180 = 228.98
c , 2448 : [119 - ( 23 - 6 ) = 2448 : [ 119 - 17 ]
= 2448 : 7
= 394.7142857
a, = 80-(4.25-3.8)
= 80 - ( 100 - 24 )
= 80 - 76
= 4
b , 23,75+25,23+180
= 48.98 + 180 = 228.98
c , 2448 : [119 - ( 23 - 6 ) = 2448 : [ 119 - 17 ]
= 2448:7
= 394.7142857
tick nhé bạn