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(15-5)*120=12001200/(10+2)=100
17.??????8??????????????????60????
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18 .?????????????????7??????5?????
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3010= 1450= 6050= 12200=3.6+2.3= 1-0.3=
50005= 21007= 501= 100100= 0.5+3=3.7-1.5=
????
839 47081786 2338 7819
??????*?????
2386= 9807= 4082=*6246=
*8436= 3927= 2540=
8-1.6= 1.4-0.8= 6+0.6= 7.3-6.8=
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57634 81+819 1232-2324 3997+294 672
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??19< 60069??<5 600
49??<7500 ??39<2400
6584= 6.5+3.9= ?23?
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