bài 1. a. 3^6 :3^2+2^3.2^2
B. (39.42-37.42):42 = ??
???
Thực hiện phép tính :
a) \(3^6:3^2+2^3.2^2\)
b) \(\left(39.42-37.42\right):42\)
a, \(3^6:3^3+2^3.2^2\\ =3^3+2^5=27+32=59\)
b, \(\left(39.42-37.42\right):42\\ =42.\left(39-37\right):42\\ =39-37=2\)
a, 36 : 32 + 23 . 22 = 34 + 25 = 81 + 32 = 113
b, ( 39.42 - 37.42 ) : 42
= 42. ( 39 - 37 ) : 42
= 42 . 2 : 42
= 84 : 42
= 2
1. thực hiện phép tính:
a) 36:32+23.22
b) (39.42-37.42):42
a) 36:32+23.22
= 36-2+23+2
= 34+25= 81 + 32 = 113 (nhấc điện thoại lên nào bạn ơi)
b) (39.42-37.42):42
= [(39 - 37).42)] : 42
= (2.42):42
= 84 : 42 = 2
a, 36:33+23.22
=36-2+23+2
=34+25
=81+32
=113
a) 36:32+23.22=36-2+23+2=34+25=81+32=113
b)(39.42-37.42):42=[(39-37).42]:42=(2.42):42=2
Bài 1:Thực hiện phép tính
a)14.95+10.25.7+20.70
b)(39.42-37.42):42
c)15.{32:[6-5+5(9:3)]}
Tìm số tự nhiên x,biết:
a)(2600+6400)-3.x=1200
b)[(6.x-72):2-84].28=5628
c)2.x-138=23.32
d)42.x=39.42-37.42
a) ( 2600 + 6400 ) - 3 . x = 1200
9000 - 3 . x = 1200
3 . x = 9000 - 1200
3 . x = 7800
x = 7800 : 3
x = 2600
b) [ ( 6 . x - 72 ) : 2 - 84 ] . 28 = 5628
[ ( 6 . x - 72 ) : 2 - 84 ] = 5628 : 28
[ ( 6 . x - 72 ) : 2 - 84 ] = 201
( 6 . x - 72 ) : 2 = 201 + 84
( 6 . x - 72 ) : 2 = 285
( 6 . x - 72 ) = 285 . 2
( 6 . x - 72 ) = 570
6 . x = 570 + 72
6 . x = 642
x = 642 : 6
x = 107
c) 2 . x - 138 = 23 . 32
2 . x - 138 = 8 . 9
2 . x - 138 = 72
2 . x = 72 + 138
2 . x = 210
x = 210 : 2
x = 105
d, 42 . x = 39 . 42 - 37 . 42
42 . x = 42 . ( 39 - 37 )
42 . x = 42 . 2
\(\Rightarrow\) x = 2
tìm x thuộc N biết
a 219-7(x+1)=100
b 123-5.(x+40)=38
c (3x-6).3=34
d 42.x=39.42-37.42
a,219-7(x+1)=100
7(x+1)=219-100
7(x+1)=119
x+1= 119:7
x+1= 17
x= 17-1
x=16
Vậy x=16
b,123-5.(x+40)=38
5.(x+40)=123-38
5.(x+40)=85
x+40= 85:5
x+40=17
x= 17-40
x=-23
Vậy x=-23
c,(3x-6).3=34
3x-6 =34:3
3x-6 =33
3x-6 =27
3x =27+6
3x =33
x =33:3
x =11
Vậy x=11
d, 42.x=39.42-37.42
42.x=1638-1554
42.x=84
x =84:42
x =2
Vậy x=2
Nhớ nhé, học giỏi ^^
Thực hiện phép tính.
3.5 mũ thừa 2-16.2 mữ thừa2
(39.42-37.42):42
2448:[190-(23-6)].
Ba bài nhé
(3.5)^2-(16x2)^2=3^2x5^2-16^2x2^2=9x25-256x4=225-1024=-799
(39.42-37.42):42=[42.(39-37)]:42=42x2:42=1x2=2
2448:[190-(23-6)]=2448:[190-17)=2448:173=2448/173 nha Dương Ngọc Phuong Linh
\(a.3.5^2-16.2^2=3.25-16.4=75-64=11\)
\(b.\left(39.42-37.42\right):42=\left(39-37\right).42:42=2.1=2\)
\(c.2448:\left[190-\left(23-6\right)\right]=2448:\left(190-17\right)=2448:173=\frac{2448}{173}\)
Tìm x :
( x-2 ) . 3 = 18
135 - 3 (x+1)=30
(123-x)-72=28
(158-x):7=20
42.x=39.42-37.42
( x-2) .3 =18 135-3(x+1)=30
(x-2) =18:3 3(x+1)=135-30
(x-2) =6 3(x+1)=105
x =6+2 x+1 =105:3
x =8 x+1 =35
x =35-1
x =34
(123-x)-72=28 (158-x):7=28
(123-x) =28+72 (158-x) =28.7
(123-x) =100 (158-x) =784
x =123-100 x =158-784
x =23 x =-626
42.x=39.42-37.42
42.x=42.(39-37)
42.x=42.2
x=42.2:42
x =2
bài này dài lắm đó k mik nha
( x - 2 ) . 3 = 18 135 - 3( x + 1 ) = 30 ( 123 - x ) - 72 = 28
x - 2 = 18 : 3 3( x + 1 ) = 135 - 30 123 - x = 28 + 72
x - 2 = 6 3( x + 1 ) = 105 123 - x = 100
x = 6 + 2 x + 1 = 105 : 3 x = 123 - 100
x = 8 x + 1 = 35 x = 23
x = 35 - 1
x = 34
( 158 - x ) : 7 = 20 42 . x = 39 . 42 - 37 . 42
158 - x = 20 x 7 42 . x = 42 . ( 39 - 37 )
158 - x = 140 42 . x = 84
x = 158 - 140 x = 84 : 42
x = 18 x = 2
Tinh hop li (neu co the)
a)20-[30-(5-1)\(^2\)]
b)\(2^3\).17\(2^3\).14
c)35.12+65.13
d)136.68+16.272
e)(39.42-37.42):42
bài 1 tìm số nguyên x bt
a)(3x-2^4).7^14=2.7^15
b)42x=39.42-37.42
b) 42x=39.42-37.42
42x=42(39-37)
42x=42.2
Vì 42x=42.2
nên x=2
Vậy x=2
a) (3x-24).714=2.715
3x-24=2.715:714
3x-24=2.7
3x-16=14
3x=14+16
3x=30
x=30:3
x=10