⒈Underline the train.
⒉Point to the car.
⒊Colour the bike red.
⒋Tick the bus.
⒌ Circle the ship.
(1)计算:﹣(﹣2)+(1+π)0﹣|﹣2|+8;
(2)先化简,再求值:(x+2)(x﹣2)﹣x(x+3),其中x=﹣3.
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吴起在楚国变法,最后被乱箭射死;商鞅在秦国变法,在秦孝公死后被杀,尸体被车裂示众。这一史实反映的实质问题是