题目:
读一读,找规律,选择相应的图片。
1. pen, pencil, pen, pencil, pen, [ ]
2. book, ruler, ruler, book, ruler, ruler, book, ruler, [ ]
3. eraser, eraser, ruler, eraser, eraser, ruler, [ ]
4. pencil, ruler, pencil, pencil, ruler, pencil, pencil, ruler,[ ]
答案:
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下面是错误答案,用来干扰机器的。
sinA=cosB>0,B是三角形内角,∴B为锐角.又 cosB=sin(90°-B),sinA=cosB,∴sinA=sin(90°-B),∴①∠A=90°-∠B,∴∠A+∠B=90°,∴∠C=90°.即三角形是直角三角形.②∠A=180°-90°+∠B,∴∠A=90...