135 × (20 + 3) 642 × (30 − 6)
427 × (10 + 8) 287 × (40 − 8)
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a) 135 x (20 + 3)
= 135 x 20 + 135 x 3
= 2700 + 405 = 3105
427 x (10 + 8)
= 427 x 10 + 427 x 8
= 4270 + 3416 = 7686
b) 642 x (30 -6)
= 642 x 30 - 642 x 6
= 19260 - 3852 = 15408
287 x (40 -8)
= 287 x 40 - 287 x 8
= 11480 - 2296 = 9184
135 x ( 20 + 3 ) = 135 x 23 = 3105
427 x ( 10 + 8 ) = 427 x 18 = 7686
642 x ( 30 - 6 ) = 642 x 24 = 15408
287 x ( 40 - 8 ) = 287 x 32 = 9184
135x(20+3)=3105
427x(10+8)=7686
642x(30-8)=15408
287x(40-8)=9184
a)135 x (20+3)=3105 b)642 x (30 - 6)=15408
427 x (10+8)=7650 287 x (40 - 8)=9184
a: =24*1000=24000
b: =120*1000=120000
c: =72(135+65):25-140
=72*8-140=436
d: =18(957-354-621):72=-9/2
a: (-17)+5+8+17
\(=\left(-17+17\right)+\left(5+8\right)\)
=0+13
=13
b: \(\left(-24\right)+6+10+24\)
\(=\left(-24+24\right)+\left(6+10\right)\)
=0+16
=16
c: \(\left(-24\right)+6+\left(-10\right)+24\)
\(=\left(-24+24\right)+\left(6-10\right)\)
=0+(-4)
=-4
d: \(\left(-456\right)+2021-544\)
\(=2021-\left(456+544\right)\)
=2021-1000
=1021
e: \(\left(-1075\right)-29-\left(-1075\right)\)
\(=-1075+1075-29\)
=0-29
=-29
f: \(\left(-135\right)+48+140-\left(-5\right)\)
\(=48+\left(-135+140+5\right)\)
=48+10
=58
g: \(329+64+\left(-394\right)+36\)
\(=\left(329-394\right)+\left(64+36\right)\)
=100-65
=35
h: \(\left(-427\right)+\left(-123\right)+23+27\)
\(=\left(-427+27\right)+\left(-123+23\right)\)
=-400-100
=-500
a) 90 – ( 30 – 20) = 90 – 10
= 80
90 – 30 – 20 = 60 - 20
= 40
b) 100 – (60 + 10) = 100 – 70
= 30
100 - 60 + 10 = 40 + 10
= 50
c) 135 – (30 + 5) = 135 – 35
= 100
135 – 30 – 5 = 105 – 5
= 100
d) 70 + (40 – 10) = 70 + 30
= 100
70 + 40 – 10 = 110 -10
= 100
a) Số phần tử:
\(\left(9-2\right):1+1=8\) (phần tử)
b) Số phần tử:
\(\left(20-2\right):2+1=10\) (phẩn tử)
c) Số phần tử:
\(\left(25-1\right):3+1=9\) (phần tử)
d) Số phần tử:
\(\left(104-2\right):2+1=52\) (phần tử)
e) Số phần tử:
\(\left(470-5\right):5+1=94\) (phần tử)
f) Số phần tử:
\(\left(500-10\right):10+1=50\) (phần tử)
a; \(\dfrac{1}{4}\) + \(\dfrac{2}{5}\) + \(\dfrac{6}{8}\) + \(\dfrac{9}{15}\) + \(\dfrac{8}{1}\)
= (\(\dfrac{1}{4}\) + \(\dfrac{6}{8}\)) + (\(\dfrac{2}{5}\) + \(\dfrac{9}{15}\)) + \(\dfrac{8}{1}\)
= (\(\dfrac{1}{4}\) + \(\dfrac{3}{4}\)) + (\(\dfrac{2}{5}\) + \(\dfrac{3}{5}\)) + 8
= 1 + 1 + 8
= 2 + 8
= 10
b; \(\dfrac{1}{2}\) + \(\dfrac{2}{4}\) + \(\dfrac{3}{6}\) + \(\dfrac{4}{8}\) + \(\dfrac{5}{10}\) + \(\dfrac{6}{12}\) + \(\dfrac{7}{14}\) + \(\dfrac{8}{16}\) + \(\dfrac{10}{20}\)
= \(\dfrac{1}{2}\) + \(\dfrac{1}{2}\) x (\(\dfrac{2}{2}\) + \(\dfrac{3}{3}\) + \(\dfrac{4}{4}\) + \(\dfrac{5}{5}\)+ \(\dfrac{6}{6}+\dfrac{7}{7}+\dfrac{8}{8}\) + \(\dfrac{10}{10}\))
= \(\dfrac{1}{2}\) + \(\dfrac{1}{2}\) x (1 + 1 +1 + 1+ 1+ 1+ 1 +1)
= \(\dfrac{1}{2}\) + \(\dfrac{1}{2}\) x 1 x 8
= \(\dfrac{1}{2}\) + \(\)\(\dfrac{1}{2}\) x 8
= \(\dfrac{1}{2}\) + 4
= \(\dfrac{9}{2}\)
135 x (20 + 3)
= 135 x 20 + 135 x 3
= 2700 + 405
= 3105.
427 x (10 + 8)
= 427 x 10 + 427 x 8
= 4270 + 3416
= 7686.
642 x (30 - 6)
= 642 x 30 - 642 x 6
= 19260 - 1452
= 18808.
287 x (40 - 8)
= 287 x 40 - 287 x 8
= 11480 - 2296
= 9184.
135x(20+3) 642 x (30-6)
= 135 x 20 + 135 x 3 = 642 x 30 - 642 x 6
= 2700+405 = 19 260 - 3852
= 3105 =15 408
427 x ( 10+8) 287 x (40 - 8)
= 427 x 10 + 427 x 8 = 287 x 40 - 287 x 8
= 4270 + 3416 =11 480 - 2296
=7686 = 9184