能简算的要简算.①23×38+57÷83②1.36×2.7+13.6×0.73③0.25×1.25÷132④(38+78-23)×24⑤[1-78÷(56+12×13)]÷712⑥2008×12007.-数学
题文
能简算的要简算. ①23×
②1.36×2.7+13.6×0.73 ③0.25×1.25÷
④(
⑤[1-
⑥2008×
|
答案
①23×
=(23+57)×
=80×
=30; ②1.36×2.7+13.6×0.73, =1.36×2.7+1.36×7.3 =1.36×(2.7+7.3), =1.36×10, =13.6; ③0.25×1.25÷
=0.25×1.25×32, =(0.25×4)×(1.25×8), =1×10, =10; ④(
=
=9+21-16, =14; ⑤[1-
|