1樓:文爺君瓣掇乊
(1)2.5×(6+9.728÷源3.2)=2.5×(bai
du6+3.04)
=2.5×9.04
=22.6
(2)45×7.3+27×4.5
=45×(7.3+2.7)
=45×10
=450
(3)0.125×3.2×25
=0.125×8×0.4×25
=(0.125×8)×zhi(0.4×25)=1×10
=10(4)[8.3-(3.6+2.9)]÷0.72=[8.3-6.5]÷0.72
=1.8÷0.72
=2.5
(5)(140+0.42)÷dao7
=140÷7+0.42÷7
=20+0.06
=20.06
(6)10.2×4.5
=(10+0.2)×4.5
=10×4.5+0.2×4.5
=45+0.9
=45.9
脫式計算(能用簡便方法的用簡便方法計算)[( 7 16 - 1 4 )+ 15 16
2樓:手機使用者
(1)[(7
16-1 4
)+15
16]÷1 2
,=[3
16+15
16]÷1 2
,=18
16 ÷1
2,=2.25;
(2)613 4
-15.37+381 4
-34.63,
=(613 4
+381 4
)-(15.37+34.63),
=100-50,
=50;
(3)23-8 9
×3 8
÷127
,=23-3 9
÷1 27
,=23-9,
=14;
(4)5.8×99-4.2,
=5.8×(100-1)-4.2,
=580-5.8-4.2,
=580-(5.8+4.2),
=580-10,
=570;
(5)10.6-(6.3+0.125÷12.5%),=10.6-(6.3+1),
=10.6-7.3,
=3.3.
脫式計算.(能用簡便方法計算的要用簡便方法計算) (1)13.6×3-40.6÷2 (2)99×0.75+14×99 (3
3樓:博
(1)13.6×
3-40.6÷2,
copy
=40.8-20.3,
=20.5;bai
(du2)99×zhi0.75+1
4×99,dao
=99×(0.75+0.25),
=99×1,
=99;
(3)(56?5
8)×24,=56
×24-5
8×24,
=20-15,
=5;(4)121×1001
121,
=121×(100+1
121),
=121×100+121×1
121,
=12100+1,
=12101;
(5)15÷3?7×(17+1
21),
=15÷3-7×421,
=5-113,
=323
;(6)246
23÷6?123,
=4123
-123
,=4.
脫式計算.(能用簡便方法的就用簡便方法計算)[8.5-(3.6+3.6)]÷2.6 10.1×8...
4樓:清風
(1)[8.5-(3.6+3.6)]÷
du2.6
=[8.5-7.2]÷2.6
=1.3÷2.6
=0.5;
(2)10.1×
zhi87
=(10+0.1)×87
=10×87+0.1×87
=870+8.7
=878.7;
(3)1.4×[(7.5+38.4)÷dao0.9]=1.4×[45.9÷0.9]
=1.4×51
=71.4.
脫式計算能用簡便計算的要簡算.(1)310+4.25+3.7+134(2)0.125×3.2×25(3)17×44+54×17(4)7.8÷
5樓:手機使用者
(1)3
10+4.25+3.7+134=3
10+3.7+4.25+13
4=(3
10+3.7)+(4.25+134)
=4+6
=10;
(2)0.125×3.2×25
=0.125×8×0.4×25
=(0.125×8)×版(權0.4×25)=1×10
=10;
(3)1
7×44+54×17=1
7×(44+54)=17
×98=14;
(4)7.8÷〔32×(1-5
8)+3.6〕
=7.8÷〔32×3
8+3.6〕
=7.8÷〔12+3.6〕
=7.8÷15.6
=0.5;
(5)5
6÷〔3
4×(79-1
3)〕=56
÷〔34×49
〕=56÷1
3=2.5.
脫式計算能簡算的要用簡便方法計算。1+2+4+8+16+32+64+128+256+512+102
6樓:匿名使用者
2.5×
0.32×125
=(2.5×0.4)×(0.8×回125)=1×100
=100
907×99+907
=907×(99+1)
=907×100
=90700
(1/3+1/4+1/5)×60
=(1/3)×60+(1/4)×60+(1/5)×60=20+15+12
=47[(1/7)-(1/9)]×63-(2/3)=(1/7)×63-(1/9)×63-(2/3)=9-7-(2/3)
=1又1/3
(3/5)×[(2/8)×2-(1/3)]=(3/5)×[(1/2)-(1/3)]
=(3/5)×(1/6)
=1/10
÷(4/5)
=×(5/4)
=(4/15)×(5/4)
=1/3
12.5×4×0.25×8
=(12.5×8)×(4×0.25)
=100×1
=100
(6/7)×125×7×8
=[(6/7)×7]×(125×8)
=6×1000
=6000
24×[(5/8)+(5/6)]-35
= 24×(5/8)+24×(5/6)-35=15+20-35
=35-35
=0(分答數我用括號括起來了,寫的時候記得去掉,5/8讀作八分之五,應該看得懂吧!)
有疑問,請追問
7樓:宇文昌
。。。你 他 媽 在玩兒我吧!
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