下列等式中正确的一个是( ).
A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15510856219283d30dbff192943c5a3ac389c8f3b928aimage40.png"style="width:109px;height:21px;"/>
B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15510856220085613cd0f2e1147119123ad2cd66d2dc6image41.png"style="width:97px;height:21px;"/>
C、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1551085622104be5f4aa1bbec49cd8ec52451863e33a5image42.png"style="width:107px;height:21px;"/>
D、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/155108562219557b342d1076040d6a54e17787f8520caimage43.png"style="width:96px;height:21px;"/>
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