问题
解答题
用你喜欢的方法计算
|
答案
①12.5×32×0.8,
=(12.5×8)×(4×0.8),
=100×3.2,
=320;
②
-4 9
+3 10
,1 3
=
-40 90
+27 90
,30 90
=
;43 90
③2.5×[(3.2+1.8)÷0.25],
=2.5×[5÷0.25],
=2.5×20,
=50;
④6.4×0.09+0.01×6.4
=6.4×(0.09+0.01),
=6.4×0.1,
=0.64.