用递等式计算,能简便的要用简便方法计算:(1.7+

2021-02-24 07:12:03 字数 3313 阅读 2131

1楼:不明

(1)(1.7+0.8)÷

bai1.25×

du0.8

=2.5÷1.25×zhi0.8

=2×0.8

=1.6;

(dao2)32.55-14.64-6.36+7.45=(32.55+7.45)-(14.64+6.36)=40-21

=19;

(3)(3.72+0.48)÷[(2-0.6)×1.5]=4.2÷[1.4×1.5]

=4.2÷2.1

=2;(4)38×2.8-2.8+2.8×63=(38-1+63)×2.8

=100×2.8

=280;

(5)9.8÷[(19.7-(4.5+2.9)×2]=9.8÷[(19.7-7.4×2]

=9.8÷[(19.7-14.8]

=9.8÷4.9

=2;(6)(25+2.5+1.25)×4=25×4+2.5×4+1.25×4

=100+10+5

=110+5

=115.

脱式计算(能简便的要简便计算) 4.5×5.2+4.5×4.8 8.8×1.25 0.4×(4.3×2.5) 60.8-1.7

2楼:手机用户

(1)4.5×

5.2+4.5×4.8

=4.5×(5.2+4.8)

=4.5×10

=45;

(2)8.8×1.25

=(8+0.8)×1.25

=8×1.25+0.8×1.25

=10+1

=11;

(3)0.4×(4.3×2.5)

=4.3×(0.4×2.5)

=4.3×1

=4.3;

(4)60.8-1.75-1.25

=60.8-(1.75+1.25)

=60.8-3

=57.8;

(5)0.4×(4.3×2.5)

=4.3×(0.4×2.5)

=4.3×1

=4.3;

(6)45×10.1

=45×(10+0.1)

=45×10+45×0.1

=450+4.5

=454.5;

(7)0.63+0.42+0.37+9.58=(0.63+0.37)+(0.42+9.58)=1+10

=11;

(8)8.36×99+8.36

=8.36×(99+1)

=8.36×100

=836;

(9)0.78×99

=0.78×(100-1)

=0.78×100-0.78×1

=78-0.78

=77.22;

(10)90÷(3.6-1.8)

=90÷1.8

=50;

(11)36÷[(6.1-4.6)×0.8]=36÷[1.5×0.8]

=36÷1.2

=30;

(12)1.6×(2.25+10.5÷1.5)=1.6×(2.25+7)

=1.6×9.25

=14.8;

(13)12.75÷[14.6-(1.3+8.2)]=12.75÷[14.6-9.5]

=12.75÷5.1

=2.5;

(14)3.2+3.91÷(19-16.7)=3.2+3.91÷2.3

=3.2+1.7

=4.9.

脱式计算(能简算的用简便算法).(1)[9.2+0.8×(9-7.75)]÷0.4; (2)3.5×9.8+0.35×2;(3)

3楼:宁负迅昭

(1)[9.2+0.8×(

9-7.75)]÷0.4

=[9.2+0.8×1.25]÷4

=[9.2+1]÷4

=2.55

(2)3.5×9.8+0.35×2

=3.5×(9.8+0.2)

=3.5×10

=35(3)28×26

27=(27+1)×

2627

=27×26

27+26

27=26+26

27=2626

27(4)[(23-3

5)×154+2

3]÷11

12=[1

15×154+2

3]÷11

12=[14+2

3]÷11

12=11

12×12

11=1

脱式计算能用简便计算的要简算.(1)310+4.25+3.7+134(2)0.125×3.2×25(3)17×44+54×17(4)7.8÷

4楼:手机用户

(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(权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.

脱式计算,能简便就简便。 7/27÷4/15x0.32 0.25÷(1-5/8)+3/8?

5楼:乐为人师

脱式计算,能简便就简便。7/27÷4/15×0.32=35/36×0.32

=14/45

0.25÷(1-5/8)+3/8

=1/4÷3/8+3/8

=2/3+3/8

=25/24

6楼:匿名用户

7/27÷4/15×0.32

=7/27×15/4×8/25

=14/45

0.25÷(1-5/8)+3/8

=1/4×8/3+3/8

=2/3+3/8

=(16+9)/24

=25/24

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