12*45+12*55=......?
Tính nhanh : 12 x 45 + 12 x 55
12 x 45 + 12 x 55
= 12 x (45 + 55)
= 12 x 100
= 1200
Ủng hộ mk nha ^_-
12 x 45 + 12 x 55
= 12 x ( 45 + 55 )
= 12 x 100
= 1200
12 x ( 45 + 55 )
12 x 100
= 1200
k mk nha!!!!
tính
12+12
45+45
63+26
54+55
12+12=24
45+45=90
63+26=89
54+55=109
12 + 12 = 24
45 + 45 = 90
54 + 55 = 109
12+ 12 . 45 + 55 = ?
Đố Các Bạn ....//
12 . 12 + 45 + 55
= 144 + (45 + 55)
= 144 + 100
= 244
= ( 12 x 12 ) + ( 45 + 55 )
= 144 + 100
= 244
Nhớ k cho mình nhé!
12 . 12 + 45 + 55
= 144 + (45+55)
= 144 + 100
= 244.
7+7-4+5-6+8-9+12+33-55+100-45+55
248
nghĩa trần và các bạn xinh đẹp,học giỏi k cho mk nha
mk nhanh nhất
(/(-45)+50/+/-55/):12+/-2015/
\(\left(\left|\left(-45\right)+50\right|+\left|-55\right|\right):12+\left|-2015\right|\)
\(=\left(\left|-45+50\right|+\left|-55\right|\right):12+\left|-2015\right|\)
\(=\left(\left|-\left(45-50\right)\right|+\left|-55\right|\right):12+\left|-2015\right|\)
\(=\left(\left|-\left(-5\right)\right|+\left|-55\right|\right):12+\left|-2015\right|\)
\(=\left(\left|5\right|+\left|-55\right|\right):12+\left|-2015\right|\)
\(=\left(5+55\right):12+\left|-2015\right|\)
\(=60:12+\left|-2015\right|\)
\(=5+\left|-2015\right|\)
\(=5+2015\)
\(=2020\)
Bài 2:Bỏ dấu ngoặc rồi tính:
1) (12+21)-(23-21+10)
2) (57-725)-(605-53)
3) (55+45+15)-(15-55+45)
45/27 - 9/12 - 22/55
-(12+21-23)-(23-21+10) bỏ dấu ngoặc rồi tính
(57-725)-(605-53) (nhu tren)
(55+45+45)- (15-55+45) (như trên)
a) -(12+21-23)-(23-21+10)
=-12-21+23-23+21-12=-12-12=-24
b)(57-725)-(605-53)
=57-725-605+53=-1220
c)(55+45+45)-(15-55+45)
=55+45+45-15+55-45=110+45-15=140
-(12+21-23)-(23-21+10)
=-12-21+23-23+21-10
=(21-21)+(23-23)-(12+10)
=0+0-22=-22
(57-725)-(605-53)
=57-725-605+53
=(57+53)-(725+605)
=110-1330
=-1220
(55+45+45)- (15-55+45)
=55+45+45-15+55-45
=(45+55)+(55-15)+(45-45)
=100+40+0=140
-(12+21-23) - (23-21+10) = -12 - 21 + 23 - 23 + 21 - 10 = (-12-10) + (21-21) + (23-23) = -22 + 0 + 0 = -22
(57 - 725) - (605 - 53) = 57 - 725 - 605 + 53 = (57 + 53) - (725 + 605) = 110 - 1330 = 1220
(55 + 45 + 45) - (15 - 55 + 45) = 55 + 45 + 45 - 15 + 55 - 45 = (55 + 55) + (45 - 45) + (45 - 15)
= 110 + 0 + 30 = 140
Tính giá trị biểu thức:
a) -(12 + 21 - 23) - (23 - 21 + 10)
b) (55 + 45 + 15) - (15 - 55 + 45)
a) ( 12 + 21 - 23 ) - ( 23 - 21 + 10 )
= 12 + 21 - 23 - 23 - 21 + 10
= ( 12 + 10 ) - ( 21 - 21 ) - ( 23 - 23 )
= 22 - 0 - 0
= 22
b) ( 55 + 45 + 15 ) - ( 15 - 55 + 45 )
= 55 + 45 + 15 - 15 - 55 + 45
= ( 55 + 45 ) + ( 55 + 45 ) + ( 15 - 15)
= 100 + 100 + 0
= 200
\(a)\)\(-\left(12+21-23\right)-\left(23-21+10\right)\)
\(=-12-21+23-23+21-10\)
\(=\left(-21+21\right)+23-23-12-10\)
\(=0+0-12-10\)
\(=-22\)
\(b)\)\(\left(55+45+15\right)-\left(15-55+45\right)\)
\(=55+45+15-15+55-45\)
\(=\left(15-15\right)+\left(45-45\right)+55+55\)
\(=0+0+55+55\)
\(=110\)