计算,能简算的要简算.7.27-(1.98+0.27)23.4×18-23.4×883×57+2÷75-571999÷1998×1998199939100×101-39100.-数学
题文
计算,能简算的要简算.
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答案
(1)7.27-(1.98+0.27), =7.27-0.27-1.98, =7-1.98, =5.02; (2)23.4×18-23.4×8, =23.4×(18-8), =23.4×10, =234; (3)83×
=83×
=(83+2-1)×
=84×
=60; (4)1999÷1998×
=
=1; (5)
=
= |