viuet dang tong quat cac tinh chat giao hoan,ket hop cua phep cong, phep nhan,tinh chat phan phoi cua phep nhan doi voi phep cong
viet dang tong quat cac phep tinh giao hoan,ket hop cua phep cong,phep nhan,tinh chat phan phoi cua phep nhan doi voi phep cong
997+37 49+194 tinh nhanh bang tinh chat ket hop cua phep cong
Ap dung tinh chat phan phoi doi voi phep cong:
13.12 ; 53.11 ; 38.101
Co the tinh nhanh tong 37+198 bang cach ap dung tinh chat ket hop cua phep cong
nho tinh chat giao hoan ,ket hop va quy tac dau ngoac ta the lam gi khi thuc hien 1 day cac phep toan cong tru cac so nguyen
ap dung cac tinh chat cua phep cong va phep nhan de tinh
E = 2 * 325 *12 + 4 *69 24 + 3 * 399 * 8
Giai nhanh va dung giup e nhe :
Ap dung cac tinh chat cua phep cong va phep nhan de tinh nhanh :
c) 25 . 5 . 4 . 27 . 2
a viet tap hop A 'phep cong'
b tinh so phan tu cua tap hop B =[2;3;4;5........;10]