計(jì)算$a - b$:
將$a$、$b$的小數(shù)點(diǎn)同時(shí)向右移動(dòng)2025位(2023個(gè)0加末兩位數(shù)字),得$a = 36,$$b = 18。$
$a - b = 36 - 18 = 18,$再將結(jié)果的小數(shù)點(diǎn)向左移動(dòng)2025位,即$0.\underbrace{000…0}_{2023個(gè)0}18。$
計(jì)算$a \div b$:
根據(jù)商不變性質(zhì),將$a$、$b$的小數(shù)點(diǎn)同時(shí)向右移動(dòng)2025位,得$a = 36,$$b = 18。$
$a \div b = 36 \div 18 = 2。$
結(jié)論:$a - b = 0.\underbrace{000…0}_{2023個(gè)0}18,$$a \div b = 2。$