脱式计算(能简便的要简便) 1.6?65+8.4?45 1.25×32×2.5 2345×19+23×2645 82×7.9+21×
脱式计算(能简便的要简便)1.6?65+8.4?451.25×32×2.52345×19+23×264582×7.9+21×8.2[35?(34-25)]÷418×(49...
脱式计算(能简便的要简便) 1.6?65+8.4?45 1.25×32×2.5 2345×19+23×2645 82×7.9+21×8.2 [35?(34-25)]÷4 18×(49-27)×21
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雨紫安V1
推荐于2016-11-24
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(1)16-
+8.4-
,
=16-1.2+8.4-0.8,
=(16+8.4)-(1.2+0.8),
=24.4-2,
=22.4;
(2)1.25×32×2.5,
=1.25×8×4×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100;
(3)
×19+23×
,
=
×19+
×26,
=
×(19+26),
=
×45,
=23;
(4)82×7.9+21×8.2,
=8.2×79+21×8.2,
=8.2×(79+21),
=8.2×100,
=820;
(5)[
?(
-
)]÷4,
=[
?+
]÷4,
=[1-
]×
,
=
×
,
=
;
(6)18×(
-
)×21,
=18×21×
-
×21×18,
=168-108,
=60.
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