问题
解答题
脱式计算 ①907×99×907 ②(
③(0.125×8-0.5)×4 ④[1-(
|
答案
①907×99×907
=89793×907
=81442251;
②(
+4 5
)÷1 4
+7 3 7 10
=
×21 20
+3 7 7 10
=
+9 20 14 20
=1
;3 20
③(0.125×8-0.5)×4
=(1-0.5)×4
=0.5×4
=2;
④[1-(
-1 2
)]×1 4 2 3
={1-
}×1 4 2 3
=
×3 4 2 3
=
.1 2