Thực hiện phép tính :
a) \(80-\left(4.5^2-3.2^3\right)\)
b) \(23.75+25.23+180\)
c) \(2448:\left[119-\left(23-6\right)\right]\)
thực hiện phép tính
a 80-(4.52-3.23)
b 23.75+25+180
c 2448:[119-(23-6)]
80-(4.52-3.23) 23.75+25.23+180
2448:[119-(23-6)]
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
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
Giúp mình nhé:
Thực hiện phép tính :
A) 80 - (4.5^2-3.2^3)
B) 23 . 75 + 25 . 23 + 180
C)2448 : [ 119 -(23-6)]
Ai nhanh mình tích
Thực hiện phép tính( tính nhanh nếu có thể):
a/ 26 + 173 + 74 + 27
b/ 75.37 + 89.46 + 75.52 - 89.21
c/ \(2^7:2^2+5^4:5^3.2^4-3.2^5\)
d/ \(100:\left\{250:\left[450-\left(4.5^3-2^2.25\right)\right]\right\}\)
a) \(26+173+74+27\)
\(=\left(26+74\right)+\left(173+27\right)\)
\(=100+200\)
\(=300\)
b) \(75\cdot37+89\cdot46+75\cdot52-89\cdot21\)
\(=75\cdot\left(37+52\right)+89\cdot\left(46-21\right)\)
\(=75\cdot89+89\cdot25\)
\(=89\cdot\left(75+25\right)\)
\(=89\cdot100\)
\(=8900\)
c) \(2^7:2^2+5^4:5^3\cdot2^4-3\cdot2^5\)
\(=2^{7-2}+5^{4-3}\cdot2^4-3\cdot2^5\)
\(=2^5+5\cdot2^4-3\cdot2^5\)
\(=2^4\cdot\left(2+5-3\cdot2\right)\)
\(=2^4\cdot\left(7-6\right)\)
\(=2^4\)
\(=16\)
d) \(100:\left\{250:\left[450-\left(4\cdot5^3-2^2\cdot25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-\left(4\cdot5^3-4\cdot5^2\right)\right]\right\}\)
\(=100:\left[250:\left(450-4\cdot5^2\cdot4\right)\right]\)
\(=100:\left[250:\left(450-400\right)\right]\)
\(=100:\left(250:50\right)\)
\(=100:5\)
\(=20\)
123-5.(x+4)=38
(3.x-2^4).7^3=2.7^4
6^2:4.3+2.5^2
5.4^2-18:3^2
80-(4.5^2-3.2^3)
23.75+25.23+180
2448:[119-(23-6)]
Tim so nhien x biet
(2600+6400)-3.x=1200
[(6.x-72):2-84].28=562
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
Tìm số tự nhiên x, biết
a, 80 - ( 4 . 52 - 3 . 23 )
b, 23.75+25.23+180
c, 2448 : [ 119 - ( 23 - 6 ) ]
a) 80-(4.52-3.23)
b) 23.75+25.23+180
c)(-257)-[(-257)+156-56
d) (-3)-(4-6)
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
Câu 1 : Thực hiện các phép tonhs sau một cách hợp lí :
a, 21 .41 + 21 . 59 + 79 . 23 + 79 . 77
b, 28 . 76 + 24 . 28 - 28 . 20
c, 56 . 73 + 73 . 44 - 730
\(d,80-\left(4.5^2-3.2^3\right)\)
\(e,\left(-12\right)+83+\left(-48\right)-\left(-17\right)\)
g, 12 + ( -2 - 2 ) - ( 28 - 24 + 12 )
Thực hiện phép tính:
a) \(\left( { - 3} \right).\left( { - 2} \right)\left( { - 5} \right).4\)
b) \(3.2.\left( { - 8} \right).\left( { - 5} \right)\).
a) \(\left( { - 3} \right).\left( { - 2} \right).\left( { - 5} \right).4\)\( = \left[ {\left( { - 3} \right).\left( { - 2} \right)} \right].\left( { - 5} \right).4\)\( = 6.\left( { - 5} \right).4 = - 30.4 = - 120\).
b) \(3.2.\left( { - 8} \right).\left( { - 5} \right)\)\( = 3.2.\left[ {\left( { - 8} \right).\left( { - 5} \right)} \right] = 6.40\)\( = 240\).