7x + 135 : 45=52
7^x + 135 : 45 = 52
7x + 135 : 45 = 52
7x + 3 = 52
7x = 52 - 3
7x = 49
7x = 72
Vậy x = 2
Bỏ ngoặc rồi tính :
a, - ( - 15 + 125 - 81 ) - ( - 85 + 75 - 19 + 100 )
b, ( 39 - 48 + 57 ) - ( - 61 + 52 + 157 )
c, ( -25 - 65 + 30 ) - ( 75 - 65 - 170 )
d, - ( - 45 - 135 + 29 ) + ( 55 - 35 - 71 )
a, -(-15+125-81)-(-85+75-19+100)
=-15-125+81-(-85)-75+19-100
=-140+81-(-85)-75+19-100
=-59-(-85)-75+19-100
=-16-75+19-100
=-91+19-100
=-72-100
=-172
tìm x :
a) (x-32).45=0
b) 25.(52-x)=25
c) 231+(312-x)=531
d) ( 7x-15):3=2
( ai giải xong trước mình tick cho )
a) (x-32).45=0
( x - 32 ) = 0 : 45
( x -32 ) = 0
x = 0 + 32
x = 32
b) 25.(52-x)=25
( 52 - x ) = 25 : 25
( 52 - x ) = 1
=> x = 52 - 1 = 51
c) 231+(312-x)=531
( 312 - x ) = 531 - 231
( 312 - x ) = 300
x = 312 - 300
x = 12
d) ( 7x-15):3=2
( 7x - 15 ) = 2x 3
( 7x - 15 ) = 6
7x = 6 + 15
7x = 21
=> x = 21 :7
x = 3
a) (x-32).45=0
x - 32 = 0
x = 0 + 32
x = 32
b) 25.(52-x)=25
52 - x = 25 : 25
52 - x = 1
x = 52 - 1
x = 52
105-(135-7x):9=97
\(105-\left(135-7x\right):9=97\\ \Rightarrow\left(135-7x\right):9=105-97\\ \Rightarrow\left(135-7x\right):9=8\\ \Rightarrow135-7x=8.9\\ \Rightarrow135-7x=72\\ \Rightarrow7x=135-72\\ \Rightarrow7x=63\\ \Rightarrow x=63:7\\ \Rightarrow x=9\)
105-(135-7x):9=97
=>(135-7x):9=8
=>135-7x=72
=>7x=63
hay x=9
105.(135-7x):9=97
Tính: (135 - 35).47 - 53.(-48 - 52)
135 − 35 .47 − 53. − 48 − 52 = 100.47 − 53. − 100 = 100.47 + 53.100 = 100. 47 + 53 = 100.100 = 10000
Tính: (135 - 35).47 - 53.(-48 - 52)
135 − 35 .47 − 53. − 48 − 52 = 100.47 − 53. − 100 = 100.47 + 53.100 = 100. 47 + 53 = 100.100 = 10000
tinh nhanh
a,(-137)+(+52).(-137)+(-137).(+47)
b,-135+135.(-19)-80.135
a,( -137 ) + (+52) . (-137) + (-137) . (+47)
<=> ( - 137 ) . 1 + 52 . ( - 137 ) + ( - 137 ) . 47
<=> ( - 137 ) . ( 1 + 52 + 47 )
<=> -137 . 100
<=> - 13700
b,-135 + 135 . ( -19 ) - 80 . 135
<=>-135 + 135 . ( -19 ) + ( -80 ) . 135
<=>-135 . 1 + 135 . ( -19 ) + ( -80 ) . 135
<=>-135 .[ ( -19 ) + ( - 80 ) + 1 ]
<=>-135.(-100)
<=>-13500