tính :
45 + 24 = 45 - 24 =
48 + 52 = 145 + 51 - 45 =
Tính theo cách hợp lý: -(24+73)-(39-173)+(139-26) ; -(145+52)+[(45-(-500)]-148
a: =-24-73-39+173+139-26
=-50+100+100
=200-50=150
b: =-145-52+45+500-148
=-100+500-200
=200
45*48-90*24+145
45*48-90*24+145
= 45*48 - 45*2 * 24 + 145
= 45 * 48 - 45 * 48 + 145
= 0 + 145 = 145
45*48-90*24+145
=45*48-45*2*24+145
=45*48-45*48+145
=0+145
=145
Tính Nhanh
45 x 48 - 90 x 24 +145
45 x 48 - 90 x 24 + 145
= 45 x 48 - 45 x 2 x 24 + 145
= 45x 48 - 45 x 48 + 145
= 0 + 145 = 145
~ Hok tốt ~
45 x 48 - 90 x 24 + 145
= 45 x 48 - 45 x 2 x 24 + 145
= 45 x 48 - 45 - 48 + 145
= 45 x ( 48 - 48 ) + 145
= 45 x 0 + 145
= 0 + 145
= 145
~ Hok tốt ~
45 x 48 - 90 x 24 + 145
= 45 x 48 - 45 x 2 x 24 + 145
= 45 x 48 - 45 x 48 + 145
= 45 x ( 48 - 48 ) + 145
= 45 x 0 + 145
= 0 + 145
= 145
123 * 456456 + 123123 * 456
45 * 48 + 90 * 24 + 145
123x456456+123123x456=56144088+56144088=112288176
45x48+90x24+145=2160+2160+145=4465
123 . 456456 + 123123 . 456
=123 . 456 . 1001 + 123 . 456 .1001
=123 . 456 . 1001 . 2
=56088 . 2002
=112288176
45 . 48 + 90 . 24 + 145
=45 . 2 . 24 + 90 . 24 + 145
=90 . (24+24) + 145
=90 . 48 + 145
=4320 + 145
=4465
chúc bạn học tốt nha
cảm ơn các bn nhưng mk cần câu trả lời theo cách tính nhanh. thankyou very much. love you
(45*46+47*48)*(51*52-49*48)*(45*128-90*64)*(1995*1996+1997*1998)
(45*46+47*48)*(51*52-49*48)*(45*128-90*64)*(1995*1996+1997*1998) = 0
(45·46+47·48)·(51·52−49·48)·(45·128−90·64)·(1995·1996+1997·1998)
=(45·46+47·48)·(51·52−49·48)·(45·2·64−90·64)·(1995·1996+1997·1998)
=(45·46+47·48)·(51·52−49·48)·(90·64−90·64)·(1995·1996+1997·1998)
=(45·46+47·48)·(51·52−49·48)·0·(1995·1996+1997·1998)
=0
(45*46+47*48)*(51*52-49*48)*(45*128-90*64)*(1995*1996+1997*1985)
24 < x < 27
x + 20 < 51
36 < x - 45 < 48
46 < x - 45 < 48
ai nhanh mình tick cho
a) x = 25 ;26
b) x = 0;1;2;3;4;...........;28;2930
c) x= 82; 83;84;85;86;87;88;89;90;91;92;93
d) x = 92
x = 25 ; 26
x = 0 ; 1 ; 2 ; ... ; 30
x = 82 ; ... ; 92
x = 92
Điền dấu >; <, = vào chỗ chấm:
45 + 3 … 50 | 54 – 2 … 54 + 2 |
45 + 30 … 35 + 40 | 54 – 20 … 52 – 40 |
45 + 34 … 34 + 45 | 54 – 24 … 45 – 24 |
Lời giải chi tiết:
45 + 3 < 50 | 54 – 2 < 54 + 2 |
45 + 30 = 35 + 40 | 54 – 20 > 52 – 40 |
45 + 34 = 34 + 45 | 54 – 24 > 45 – 24 |
+AHƯUẺ6T89U0I-O=ỠNTFIGO8;.,DLDYHỤ890L,SLRT7DFGUYI0-L, G.UIO.;UI...............................................................................................................................................................chó
tính bằng cách nhanh nhất : ( 51 x 52 - 49 x 48 ) x ( 45 x 128 ) x ( 45 x128 - 90 x 64) x ( 1995 x 1996 x 1997)=
( 51 x 52 - 49 x 48 ) x ( 45 x 128 ) x ( 45 x128 - 90 x 64) x ( 1995 x 1996 x 1997)
= ( 51 x 52 - 49 x 48 ) x ( 45 x 128 ) x ( 5760 - 5760 ) x ( 1995 x 1996 x 1997)
= ( 51 x 52 - 49 x 48 ) x ( 45 x 128 ) x 0 x ( 1995 x 1996 x 1997)
= 0.
#Y/n