直接写得数． + = ÷ = 1÷ = × ×3= 0× = 4× ÷4× = 8×12.5%= ÷80%=

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$\text{[math]}$ + $\text{[math]}$ =	$\text{[math]}$ ÷ $\text{[math]}$ =	1÷ $\text{[math]}$ =	$\text{[math]}$ × $\text{[math]}$ ×3=
0× $\text{[math]}$ =	4× $\text{[math]}$ ÷4× $\text{[math]}$ =	8×12.5%=	$\text{[math]}$ ÷80%=

1. 直接写得数． + = ÷ = 1÷ = × ×3= 0× = 4× ÷4× = 8×12.5%= ÷80%=