解:四千零二十万零三十写作( 40200030 ) ∵已知需把四千零二十万零三十写作数学形式 1万 = 1 × 10000 = 10000 4020万 = 4020 × 10000 = 40200000 ∴四千零二十万零三十 = 40200000 + 30 = 40200030 答:四千零二十万零三十写作40200030
读作40200030
40250000
40200030