能简算的要简算(1)4.9÷710+3.7÷710-1.6÷710(2)40-15×(23+15)×2(4)89×[34-(716-0.25)](5)[154-(0.2+13)×4.5]÷0.125.
编辑:chaxungu时间:2026-04-27 13:18:51分类:小学数学题库
能简算的要简算
(1)4.9÷
+3.7÷
-1.6÷
(2)40-15×(
+
)
(3)98%×99+(1-1%)×2
(4)
×[
-(
-0.25)]
(5)[
-(0.2+
)×4.5]÷0.125.
(1)4.9÷
+3.7÷
-1.6÷
,
=4.9×
+3.7×
-1.6×
,
=(4.9+3.7-1.6)×
,
=(8.6-1.6)×
,
=7×
,
=10;
(2)40-15×(
+
),
=40-15×
-15×
,
=40-10-3,
=30-3,
=27;
(3)98%×99+(1-1%)×2,
=98×99%+99%×2,
=(98+2)×99%,
=100×99%,
=99;
(4)
×[
-(
-0.25)],
=
×[
-
+
],
=
×[1-
],
=
×
,
=
;
(5)[
-(0.2+
)×4.5]÷0.125,
=[
-0.2×4.5-
×4.5]÷0.125,
=[
-0.9-1.5]÷0.125,
=1.35÷0.125,
=1.08.