下面各题，怎样算简便就怎样算 × × = × ﹣ ÷ = × ÷ = 4﹣ ﹣ = 3

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$\text{[math]}$ × $\text{[math]}$ × $\text{[math]}$ =	$\text{[math]}$ × $\text{[math]}$ ﹣ $\text{[math]}$ ÷ $\text{[math]}$ =	$\text{[math]}$ × $\text{[math]}$ ÷ $\text{[math]}$ =
4﹣ $\text{[math]}$ ﹣ $\text{[math]}$ =	30×（ $\text{[math]}$ + $\text{[math]}$ ）=	（99+ $\text{[math]}$ ）÷9=

1. 下面各题，怎样算简便就怎样算 × × = × ﹣ ÷ = × ÷ = 4﹣ ﹣ = 30×（ + ）= （99+ ）÷9=