230 1800 60 7200
380 2000 50 1400
5/6 3/7 4/9 3/8
二、
1620 6120 4.3 1.7
三、
=214+128
=342
=46x9
=414
=324÷4
=81
四、
1.
2 3
2.
7/10 0.7
1 7
8/10 0.8 5 8
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