Rút gọn các phân số sau: a) \(\dfrac{-21}{28}\); \(\dfrac{-39}{52}\); \(\dfrac{-24}{63}\); \(\dfrac{12}{-21}\) b, \(\dfrac{-270}{450}\); \(\dfrac{11}{-143}\); \(\dfrac{-132}{156}\); \(\dfrac{-26}{169}\)
a) 2×24×25+3×41×16+6×2×8×17
b)15×360+15×2×27+1500
c)47×63+53×21+47×37+53
d)2×169×12-3×68×8-24
e)2×56×24-3×36×16+4×12×95-6×3×8×5
f)(36×15×169)÷(5×18×13)
h)(112+2×28-5×28)÷28
i)1448-(448+500)
rut gon roi tinh: (84/144-225/60-169/65):(3/2-64/48-96/42)
Tính hợp lí:
1) -(-66)+34+(-73)-27+99
2) 54-(45-30+54)-30+5
3)42-56+33-(33+56+42)
4)50-(47+50-18)+(47-18)
5)|25-24-10|-(28-30+4)
Tính
E=(169-4^2).(169-5^2).(169-6^2).(169-7^2).(169-8^2).(169-9^20).(169-10^2).(169-11^2).(169-12^2).(169-13^2)
b/ ( 169-1).( 169-2^2).( 169-3^2)…(169-12^2).(169-13^2)
viet so la ma
89, 169, 234, 376, 495,
(169-42)(169-52)(169-62)..............(169-142)(169-152)
b) ( 169 - 1 ) . ( 169 - 3 mũ 2 ) ....... ( 169 - 12 mũ 2 ) . ( 169 - 13 mũ 2 )
Tính giá trị của biểu thức:
A= (169-1.1) .(169-2.2) .(169-3.3)....(169-20.20)
