62+42x5-625:25
b,13+21x5-(198:11-8)
c, 68+42x5-625:25
d,18-4x(27-90+73):10
\(13+21\times5-\left(198:11-8\right)\) \(68+42\times5-625:25\)
\(=13+105-\left(18-8\right)\) \(=68+210-25\)
\(=13+105-10\) \(=278-25\)
\(=118-10\) \(=253\)
\(=108\)
12x18+14x3-255:17
68+42x5-625:25
13+21x5-(198/11-8)
272:16-5+4x(30-5-255:17)
25x8-12x5+272:17-8
12x18+14x3-255:17
=216+42-15
=258-15
=243
68+42x5-625:25
=68+210-25
=278-25
=253
13+21x5-(198/11-8)
=13+105-(18-8)
=13+105-10
=118-10
=108
272:16-5+4x(30-5-255:17)
=17-5+4x(30-5-15)
=17-5+4x(25-15)
=17-5+4x10
=17-5+40
=12+40
=52
25x8-12x5+272:17-8
=200-60+16-8
=140+16-8
=156-8
=148
tinh gia tri cua bieu thuc sau 42x3+42x5+42x5-84
Nguyễn thị kim oanh nè,bài của cậu đây.
Tính nhanh:
(75 x 625+175 x 625) : (20 x 25 x 125 - 625 x 75)
Cách làm:
(75 x 625+175 x 625) : (20 x 25 x 125 - 625 x 75)
=625 x (175+75) : (20 x 5 x 125 x 5 - 625 x 75)
=(625 x 250) : (20 x 5 x 625 - 625 x 75)
=(625 x 250 : (100 x 625 - 625 x 75)
=(625 x 250) : (625 x (100-75))
=(625 x 250) : (625 x 25)
=10
0,6-3\25-3\125-3\625
0,8-4\25-4\125-4\625
Tính:
15 x 7 30 x 6 28 x 7 42 x 5
15 x 7 105 30 x 6 180 28 x 7 196 42 x 5 210
42x3+42x5+42x4-84=?
42 x 3 + 42 x 5 + 42 x 4 - 84
= 42 x 3 + 42 x 5 + 42 x 4 - 42 x 2
= 42 x ( 3 + 5 + 4 - 2 )
= 42 x 10
= 420
42x3+42x5+42x4-84=42x3+42x5+42x4-42.2=42.(3+5+4-2)=42.10=420
42x5^3 +47x116-47x114
42.53+47.116-47.114
= 42.125+(47.116-47.114)
= 5250+47(116-114)
= 5250+47.2
= 5250+94
= 5344
Đặt tính rồi tính (theo mẫu)?
a) 2 294 : 62 2 625: 75 27 360 : 36
b) 4 896 : 12 2 461 : 23 3 570 : 34