1) tinh {23.30-[76-(9-3)2]}:50
Thuc hien phep tinh :
{ 23 . 30 - [ 76 -( 9 - 3)2]} : 50
Thuc hien phep tinh :
a) { 23 . 30 - [ 76 - ( 9 -3 )2 ]} : 50
b) Viet tich sau duoi dang mot luy thua :
x3 . x4 . x5 ....x49 . x50
tinh nhanh:
76*49+76*50*76
76 * ( 49 + 50 + 1 )
= 76 * 100
= 7600
76*49+76*50+76
= 76*(49+50+1)
=76*100
=7600
k mình nha
{23.30-[76-(9-3)2]} :50 = ?
{8.30-[76-(9-3)2 ]} :50
={240-[76-36]} :50
={240-40} :50
=200:50 =4
8.30-{[76 - 36]} : 50
8. -10 : 50 = -0,032
{23.30-[76-(9-3)2]} :50 = ?
nhầm
{23-[76-(9-3)2]} : 50
= 23 - [76 - 36] : 50
= 8 - 40 : 50
= 8 - 4/5
= 36/5
Tinh
A)1×3+2×5+3×7+4×9+...+50×101
b)1×5+2×7+3×9+4×11+...+50×103
{ 2 3 x 30 - [ 76 - ( 9 - 3 ) 2 ] } : 50
={ 2 3 x 30 - [ 76 - ( 9 - 3 ) 2 ] } : 50
={ 6 x 30 - [ 76 - 62 ] } :50
={ 180 - [ 76 - 36 ]} :50
={ 180 - 40 } :50
=140 :50
=2,8
{2^3 x 30-[ 76-(9-3)^2]} : 50
= { 8x30-[76-6^2]} :50
= [240-(76-36)]:50
=( 240-40):50
=200:50
=4
Tìm x, biết 3x+2 - 3x = 72
Bài 2) { 23.30-[76-(9-3) : 50 = ?
Tinh nhanh
a,A=2018^(1*9*4*6)*(9*4*7)***(1*9*9*9)
b,B=(1000—1^3)*(1000—2^3)*(1000—3^3)***(1000—50^3)