Question

【题目】脱式计算。

204×2×5=________ 12÷（4＋2）=________ 18×5－40=________ （50＋60）×7=________

312×4×2=________ 125＋75×2=________ 25＋72×6=________ 200－39×3=________

Answer 1

【答案】2040；2；50；770；2496；275；457；83

【解析】204×2×5

=408×5

=2040

12÷(4+2)

=12÷6

=2

18×5-40

=90-40

=50

(50+60)×7

=110×7

=770

312×4×2

=1248×2

=2496

125+75×2

=125+150

=275

25+72×6

=25+432

=457

200-39×3

=200-117

=83

故答案为：2040；2；50；770；2496；275；457；83