问题
解答题
用简便方法计算. ①
②10.69-2.5×2.4. |
答案
①
×0.35+0.65÷4 15 15 4
=
×0.35+0.65×4 15
,4 15
=(0.35+0.65)×
,4 15
=1×
,4 15
=
;4 15
②10.69-2.5×2.4
=10.69-2.5×0.4×6,
=10.69-1×6,
=10.69-6,
=4.69.
用简便方法计算. ①
②10.69-2.5×2.4. |
①
×0.35+0.65÷4 15 15 4
=
×0.35+0.65×4 15
,4 15
=(0.35+0.65)×
,4 15
=1×
,4 15
=
;4 15
②10.69-2.5×2.4
=10.69-2.5×0.4×6,
=10.69-1×6,
=10.69-6,
=4.69.