问题 解答题
下面各题怎样简便就怎样计算.
785+399425+79+25(63-25)×2
348+157-3523800-1900-1100480+120÷6
1038-49678÷(45-42)37×7-7+124.
答案

(1)785+399

=785+400-1

=1185-1

=1184

(2)425+79+25

=425+25+79

=450+79

=529

(3)(63-25)×2

=63×2-25×2

=126-50

=76

(4)348+157-352

=505-352

=153

(5)3800-1900-1100

=3800-(1900+1100)

=3800-3000

=800

(6)480+120÷6

=480+20

=500

(7)1038-496

=1038-500+4

=538-4

=534

(8)78÷(45-42)

=78÷3

=26

(9)37×7-7+124

=259-7+124

=252+124

=376

单项选择题
单项选择题