解:83一9x3等于( 56 )
∵已知需求出83一9x3等于多少
∴83 - 9 x 3
= 83 - 27
= (80 + 3)- (30 - 3)
= 80 + 3 - 30 + 3
= (80 - 30)+(3 + 3)
= 50 + 6
= 56
答:83一9x3等于56