解:29x71+ 71x71等于( 7100 ) ∵已知需求出29x71+ 71x71等于多少 X × Y + X × Z = X × (Y + Z) ∴29 x 71 + 71 x 71 = 71 × (29 + 71) = 71 × 100 = 7100 答:29x71+ 71x71等于7100