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1.
6.28-(1.28+2.18)
=6.28-1.28-2.18
=5-2.18
=2.82
0.94+0.46+9.54
=0.94+(0.46+9.54)
=0.94+10
=10.94
25×1.6×1.25
=(25×2)×(0.8×1.25)
=50×1
=50
0.56×9.9+056×0.1
=0.56×(9.9+0.1)
=0.56×10
=5.6
2.
1+19 3+17 5+15 7+13 9+11
3.
1.41 1.42 1.43 1.44 1.45
1.46 1.47 1.48 1.49
共9种
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