3.07-0.38-2.62 8.5×9.9+8.5×0.1
= 3.07-(0.38+2.62) = 8.5×(9.9+0.1)
= 3.07-3 = 8.5×10
= 0.07 = 85
5: 12.5×80×30
= 1000×30
= 30000(千克)
6: 35.7÷30÷(2×7)
= 35.7÷30÷14
= 0.085(万元)
= 850(元)
7: 1.5×20-17.2
= 30 - 17.2
= 12.8(元)
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