a) B = [ ( 315 + 372 ) . 3 + ( 372 + 315 . 7 ] : ( 26 . 13 + 74 . 14 )
= [687.3+687.7]:1374=6870:1374=5
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1. Tính nhanh
a, (315+372)×3+(372+315)×7/26×13+74×14
bai 1: Thuc hien phep tinh
a) 75/100 + 18/21 + 19/32 + 1/4 + 3/21 + 13/32
b) 22/5 + 51/9 + 11/4 + 3/5 + 1/3 + 1/4
bai 1: thuc hien phep tinh a) 62 : 4 . 3 + 2 . 52b) 5 . 42 - 18 : 32c) 2448 : [ 119 - ( 23 - 6 ) bai 2 : tim x , biet :a) 125 - 5 ( x + 4 ) 38b) (3x - 24) . 73 - 2 . 74c) 70 : x , 84 : x va x 8d) x : 12, x : 25 , x : 30 va 0 x 500bai 3 : So hoc sinh khoi 6 cua mot truong khoang tu 200 den 400 khi xep ha...
Đọc tiếp
bai 1: thuc hien phep tinh a) 62 : 4 . 3 + 2 . 52
b) 5 . 42 - 18 : 32
c) 2448 : [ 119 - ( 23 - 6 )
bai 2 : tim x , biet :
a) 125 - 5 ( x + 4 ) = 38
b) (3x - 24) . 73 - 2 . 74
c) 70 : x , 84 : x va x > 8
d) x : 12, x : 25 , x : 30 va 0 < x < 500
bai 3 : So hoc sinh khoi 6 cua mot truong khoang tu 200 den 400 khi xep hang 12 hang,15 hang 18 hang vua du . Tinh so hoc sinh do
Thuc hien phep tinh
Thuc hien phep tinh 1 cach hop li
a, A = 120 - ( 61) × (-2)^3 × ( -1)^ 2n ( n thuoc N*)
b, B = 136 × (-47) +36 × 47 - (-1)^n (n le)
c, C = (-48) + 72 +36 + (-304)
khong thuc hien phep nhan hay nhan xet xem moi tich sau tan cung boi chu so nao ?
a, 1 2 3 4 5 6 7 8 9
b, 1 3 5 7 9 11
2.Thuc hien phep tinh
\(\dfrac{1}{\dfrac{3}{\dfrac{4}{3}}+1}\) la \(\dfrac{3}{4}\) nhe cau
340-(200+40)
150:(20+5)
thuc hien phep tinh nha
1.Thuc hien phap tinh a) (2dfrac{3}{5}-3dfrac{5}{9}):(3dfrac{10}{21}-1dfrac{3}{7}) b) 5dfrac{1}{2}-14dfrac{3}{7}:dfrac{9}{13}-3dfrac{4}{7}:dfrac{9}{13}
Đọc tiếp
1.Thuc hien phap tinh a) \((\)\(2\dfrac{3}{5}\)-\(3\dfrac{5}{9}\)\()\):\((\)\(3\dfrac{10}{21}\)-\(1\dfrac{3}{7}\)\()\) b) \(5\dfrac{1}{2}\)-\(14\dfrac{3}{7}\):\(\dfrac{9}{13}\)-\(3\dfrac{4}{7}\):\(\dfrac{9}{13}\)