5 5 17 3 6 7 5 5用简便方法

2021-03-17 06:39:03 字数 2429 阅读 4281

1楼:清溪看世界

5.5×17.3+6.7×5.5

=5.5×(17.3+6.7)

=5.5×24

=132

此题目采用了乘法结合律的方法进行简便运算,乘法结合律是乘法运算的一种,也是众多简便方法之一。三个数相乘,先把前两个数相乘,再和另外一个数相乘,或先把后两个数相乘,再和另外一个数相乘,积不变。

2楼:微光潮汐

原式=5.5x(17.3+6.7)

=5.5 x 24

=5.5 x(20+4)

=55 x2 + 5.5 x 4

=110+22

=132

3楼:百度网友

5.5×17.3+6.7×5.5=5.5x(17.3+6.7)=5.5x24=132

脱式计算,能简算的用简算.5.5×17.3+6.7×5.5 ...

4楼:匿名用户

(1)5.5×17.3+6.7×5.5

=5.5×(17.3+6.7)

=5.5×24

=132;

(2)1.5×105

=1.5×(100+5)

=1.5×100+1.5×5

=150+7.5

=157.5;

(3)9.07-22.78÷3.4

=9.07-6.7

=2.37;

(4)3.8+4.29+2.1+4.2

=(3.8+4.2)+(4.29+2.1)=8+6.39

=14.39;

(5)2.65×1.7+1.35×1.7

=(2.65+1.35)×

1.7=4×1.7

=6.8;

(6)23.4÷7.8-2.1

=3-2.1

=0.9;

(7)0.75×18÷0.15

=13.5÷0.15

=90;

(8)2.5×3.2×1.25

=2.5×(4×0.8)×1.25

=(2.5×4)×(0.8×1.25)

=10×1

=10;

(9)0.26×2.5+0.74×2.5+2.5=(0.26+0.74+1)×2.5

=2×2.5

=5;(10)18.09-7.5×(0.14+1.06)=18.09-7.5×1.2

=18.09-9

=9.09;

(11)9÷[(38.02+1.98)×0.5]=9÷[40×0.5]

=9÷20

=0.45;

(12)26×20.2-8.4-1.8

=525.2-8.4-1.8

=516.8-1.8

=515;

(13)90-78.09+4.23

=11.91+4.23

=16.14;

(14)32.34÷2.l×0.45

=15.4×0.45

=6.93;

(15)15.32-1.8×5-3.46

=15.32-9-3.46

=6.32-3.46

=2.86;

(16)(9-2.78)×15÷3.11

=6.22×15÷3.11

=93.3÷3.11

=30;

(17)(1.36+4.85)÷(0.15×6)=6.21÷0.9

=6.9;

(18)3.6÷[(1.3+0.6)×5]=3.6÷[1.9×5]

=3.6÷9.5

=3695

;(19)0.01+1.01×99

=0.01+(1+0.01)×99

=0.01+1×99+0.01×99

=0.01×(1+99)+99

=0.01×100+99

=1+99

=100;

(20)89.3×43+38×89.3+893×1.9=89.3×43+38×89.3+89.3×19=89.3×(43+38+19)

=89.3×100

=8930;

(21)10.01×101-10.01

=10.01×(101-1)

=10.01×100

=1001;

(22)38×7.3+27×3.8

=3.8×73+27×3.8

=3.8×(73+27)

=3.8×100

=380;

(23)32×1.25×0.25

=(4×8)×1.25×0.25

=(4×0.25)×(8×1.25)

=1×10

=10;

(24)38.75-(24.5+8.75)=38.75-24.5-8.75

=38.75-8.75-24.5

=30-24.5

=5.5.

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