问几道数学思考题(急 ⑴62又80/89×1/9⑵9又4/5+99又4/5+999又4/5+9999又4/5+4/5⑶2006÷2006又2006/2007⑷1×3+2×6+3×9+4×12+5×15/1×2+2×4+3×6+4×8+5×10⑸84又4/19×1.375+105又5/19×0.9⑹(1+1/2) ×(1

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