万以内四位数的加减法口算:4492-3409=4814+4678=4174-1986=1242-1014=7648+1606=8314+1415=2523+5841=3536-2768=5984+1393=9379-3724=1297+6439=8125-2304=2396-1738=5590+2856=5126+2455=4492-3409= 4814+4678= 4174-1986= 1242-1014= 7648+1606= 8314+1415= 2523+5841= 3536-2768= 5984+1393= 9379-3724= 1297+6439= 8125-2304= 2396-1738= 5590+2856= 5126+2455= 4492-3409= 4814+4678= 4174-1986=5000–1234=
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