问题 解答题
脱式计算,能简算的可以简算
49×102-2×49
125×76×8
8.33-2.43-4.57103×32
36×99+3641000÷8÷125
(39+21)×(84÷7)550+230×62÷31
(324-285)×12÷26.
答案

(1)49×102-2×49

=49×(102-2)

=49×100

=4900;

(2)125×76×8

=125×8×76

=1000×76

=76000;

(3)8.33-2.43-4.57

=8.33-(2.43+4.57)

=8.33-7

=1.33;

(4)103×32

=(100+3)×32

=100×32+3×32

=3200+96

=3296;

(5)36×99+36

=36×(99+1)

=36×100

=3600;

(6)41000÷8÷125

=41000÷(8×125)

=41000÷1000,

=41;

(7)(39+21)×(84÷7)

=60×12

=720;

(8)550+230×62÷31

=550+230×(62÷31)

=550+230×2

=550+460

=1010;

(9)(324-285)×12÷26

=39×12÷26

=468÷26

=18.

单项选择题
单项选择题