摘要： If .then result of is .
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Let a be integral part of
and b be its decimal part．Let c be the integral part of π and d be the decimal part． if ad-bc=m，then（ ）
（英汉词典：integralpart整数部分；decimalpart小数部分）
| 2 |
（英汉词典：integralpart整数部分；decimalpart小数部分）
| A、-2＜m＜-1 |
| B、-1＜m＜0 |
| C、0＜m＜1 |
| D、1＜m＜2 |
If the ratio of the degree of exterior angle of∠A，∠B and∠C that are in the triangle ABC is 5：4：3，then the ratio of the degree of∠A，∠B and∠C is（ ）
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As in figure 2．In the circular ring of which center is point O．if AO⊥BO，and the area of the shadowy part is 25cm2，then the area of the circuiar ring equals to（ ） （π≈3.14）