1楼:手机用户
(du1)8.5×
zhi(2.36+2.42)÷0.25,
=8.5×4.78÷0.25,
=40.63÷0.25,
=162.52;
dao(2)3.9÷1.3×6,
=3×6,
=18;
(3)4.25×6.3+3.7×4.25,=4.25×(6.3+3.7),
=4.25×10,
=42.5;
(4)205×99,
=205×(100-1),
=205×100-205×1,
=20500-205,
=20295;
(5)25.6-7.49-2.51,
=25.6-(7.49+2.51),
=25.6-10,
=15.6;
(6)2.5-(6.8-4.9)×0.8,=2.5-1.9×0.8,
=2.5-1.52,
=0.98.
计算下面各题.(能简便的要用简便方法计算)2.3+3.91÷(22-19.7)21.6÷[64.8-(48.6-2.7×2)]0.25×0
2楼:手机用户
(1)2.3+3.91÷(22-19.7)=2.3+3.91÷2.3
=2.3+1.7
=4(2)21.6÷[64.8-(48.
6-2.7×2)]=21.6÷[64.
8-(48.6-5.4)]=21.
6÷[64.8-43.2]
=21.6÷21.6
=1(3)0.25×0.03×4
=(0.25×4)×0.03
=1×0.03
=0.03
0.13×3.89+0.13×5.11
=0.13×(3.89+5.11)
=0.13×9
=1.17
(5)10.1×87
=(10+0.1)×87
=10×87+0.1×87
=870+8.7
=878.7
计算下面各题,能简便计算的用简便方法计算.4.82-5.2÷0.8×0.6 [ 1 2 -( 3 4
3楼:路肯霘
(1)4.82-5.2÷0.8×0.6,62616964757a686964616fe58685e5aeb931333335336530
=4.82-6.5×0.6,
=4.82-3.9,
=0.92;
(2)[1 2
-(3 4
-3 5
)]÷7
10,=[1 2
-320
]÷710
,=720
÷710
,=1 2
;(3)7 9
×511
+2 9
×511
,=(7 9
+2 9
)×511
,=1×5
11,=5
11;(4)12.3×99,
=12.3×(100-1),
=12.3×100-12.3×1,
=1230-12.3,
=1217.7;
(5)57.5-14.25-153 4
,=57.5-(14.25+153 4
),=57.5-30,
=27.5;
(6)3.2×12.5×0.25,
=8×0.4×12.5×0.25,
=(8×12.5)×(0.4×0.25),=100×0.1,
=10.
计算下面各题,能简算的要简算. (4.2+4.2÷2.1)÷0.2 17÷[(1.2+0.5)×5
4楼:法克鱿
解;(bai1)(4.2+4.2÷du2.1)÷0.2,zhi=(4.2+2)÷0.2,
=6.2÷0.2,
=31;dao
(2)17÷[(1.2+0.5)×5],
=17÷[1.7×5],
=17÷8.5,
=2;(3)0.9+99×0.9,
=0.9×(99+1),
=0.9×100,
=90;
(4)8.59-4.1×0.1-4.59,=8.59-0.41-4.59,
=8.59-(0.41+4.59),
=8.59-5,
=3.59.
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