按照运算顺序添加括号．（1）60+120﹣25×4 最后一步算加法；（2）534﹣7×23+24 最后一步算乘法；（3）632﹣8×21+54 最后一步算减法；（4）43×40÷5+12 先除法再加法最后算乘法．
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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