（中山市）每题都要有必要的计算过程．①23×2424﹣24×2323②52.44×79.45+159×47.56+79.55×52.44③④⑤．
能简则简+++= ﹣（+）=×÷=﹣+= ××=×÷6=
直接写得数．+= ÷= ﹣= +=+=++= +﹣= ×9=×= ÷= ×= ÷=
解方程x﹣=； 4x+=； x﹣0.3x=21．
计算（能简算的要简算）﹣+=××=÷÷=
直接写得数+= 1﹣= ﹣= ﹣=×= ×= 0×=÷6=÷8= 2﹣= ÷=÷=
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