tính nhanh
763 x 28 + 1364 x 21 + 14 x 474 + 42 x 318 =............................................................................................................................................................................................................................................................................................................................................................................................................
312312/131131 x 524524/104104 =............................................................................................................................................................................................................................................................................................................................................................................................................
( 1 + 1/105 ) x ( 1 + 1/106 ) x ( 1/107 ) =....................................................................................................................................................................................................................................................................................................................................................................................................
143x14x30/35x78x44 =....................................................................................................................................................................................................................................................................................................................................................................................................
1919/2323 x 464646/747474 x 37/19 = ......................................................................................................................................................................................................................................................................................................................................................................................................
