问题
计算题
脱式计算。(能简算的要简算)
|
答案
(1)原式=99×(100+1)
=9900+99
=9999
=25×40
=1000
(3)原式=(78+22)×16
=100×16
=1600
= 450+180+19.4
=946.4
(5)原式=15×(83+17)
=15×100
=1500
=6.8+120+12
=138.8
选择题
脱式计算。(能简算的要简算)
|
(1)原式=99×(100+1)
=9900+99
=9999
=25×40
=1000
(3)原式=(78+22)×16
=100×16
=1600
= 450+180+19.4
=946.4
(5)原式=15×(83+17)
=15×100
=1500
=6.8+120+12
=138.8