已知公式，用表示R的式子为[]A.B.C.D.-八年级数学

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• 计算（）-九年级数学
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• 已知：则下列变形错误的是[]A.R=r1+r2B.R=C.R=D.-八年级数学
• Mr. Zhang is ill, so I'll _____ till he is well again.[ ]A. take placeB. take his place C. take
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• He there with us though he was not feeling well. [ ]A. insisted on going B. insisted to go C. insist
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