问题
计算题
小小神算手。(简算) | ||||
|
答案
(1)3.75×99+3.75
=3.75×(99+1)
=3.75×100
=375
=62×(100+0.1)
=62×100+62×0.1
=6200+6.2
=6206.2
(3)2.5×36
=2.5×4×9
=10×9
=90
=1.25×8×39
=10×39
=390
单项选择题
小小神算手。(简算) | ||||
|
(1)3.75×99+3.75
=3.75×(99+1)
=3.75×100
=375
=62×(100+0.1)
=62×100+62×0.1
=6200+6.2
=6206.2
(3)2.5×36
=2.5×4×9
=10×9
=90
=1.25×8×39
=10×39
=390