竖式计算．3.906+0.66=7.04×2.5=8.64÷8=73﹣33.16=
解方程． x+=； x﹣=； 5x﹣=．
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）﹣+=××=÷÷=
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