This document contains 3 math word problems involving subtraction. The first asks the value of Q in the equation 784 - 8902 + 89,566. The second asks the value of S in 930,928 - 905 - 78,921. The third asks the value of X in 972,456 - 78,293 - 430.

1. 减法练习题

2. 题目 1
( Q ) - 784 - 8 902 = 89 566
Q = 89 566 + 784 + 8 902
= ______________

3. 题目 2
930 928 - 905 - ( S ) = 78 921
S = 930 928 - 905 - 78 921
= ________________

4. 题目 3
972 456 - 78 293 = ( X ) - 4 30
X = 972 456 – 78 293 + 430
= ________________