2.5460 209 160
3.> = < >
4.(1)A (2)B (3)B (4)C
5.72-36÷4=63
(45-21)×4=96
6.(68+37)÷5=21(次)
7.(240+250)÷7=70
8.30×11=330千克
330<340 够
9.(3×350)-350=700
10. 100÷5=20
20×30=600
11.(1)4+5+7+8=24
(2) 9 - 5 + 2 × 10=24
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