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TL:
\(\text{567 x 23 + 433 x 23}\)
\(=\left(567+433\right) x 23\)
\(=1000x 23\)
\(=23000\)
HT
\(\frac{11}{6}\times\frac{15}{23}-\frac{11}{6}\times\frac{7}{23}\)= \(\frac{11}{6}\times\left(\frac{15}{23}-\frac{7}{23}\right)\)
=\(\frac{11}{6}\times\frac{8}{23}\)
= \(\frac{44}{69}\)
Hướng dẫn giải:
a) 987 x 23 + 987 x 77
= 987 x (23 + 77)
= 987 x 100
= 98700
b) 2928 x 69 – 1928 x 69
= (2928 – 1928) x 69
= 1000 x 69
= 69000
TL:
a)25 x 12 x 30 x 4
= (25 x 5) x (12 x 30)
= 100 x 360
= 36000
b)23 + 23 x 2 + 23 x 3 +23 x 4
= 23 x 1 + 23 x 2 + 23 x 3 +23 x 4
= 23 x (1 + 2 + 3 + 4)
= 23 x 10
= 230
c)248 x 2005 - 2005 x 148
= (248 - 148) x 2005
= 100 x 2005
= 200500
HT
13/19 x 23/11 - 13/19 x 8/11 - 13/19 x 4/11
= 13/19 x (23/11 - 8/11 - 4/11)
= 13/19 x 1
= 13/19
\(\dfrac{13}{19}\times\dfrac{23}{11}-\dfrac{13}{19}\times\dfrac{8}{11}-\dfrac{13}{19}\times\dfrac{4}{11}\\ =\dfrac{13}{19}\times\left(\dfrac{23}{11}-\dfrac{8}{11}-\dfrac{4}{11}\right)\\ =\dfrac{13}{19}\times1=\dfrac{13}{19}\)
a) 234 + 567 + 766 + 433
= (234 + 766) + (567 + 433)
= 1 000 + 1 000
= 2 000
b) 2 023 + 7 602 - 1 023 + 1 398
= (2 023 - 1 023) + (7 602 + 1 398)
= 1 000 + 9 000
= 10 000
c) 4 789 - 2 567 - 7 433 + 5 211
= (4 789 + 5 211) - (2 567 + 7 433)
= 10 000 - 10 000
= 0
c, 5 - 10 + 15 - 20 + 25 - 30 + 35 - 40 + 50 - 55 + 60 - 65 + 70
= 5 + (15 - 10) + (25 - 20) + (35 - 30) + (50 - 40) + (60 - 55) + (70 - 65)
= 5 + 5 + 5 + 5 + 10 + 5 + 5
= (5 + 5) + (5 + 5) + 10 + (5 + 5)
= 10 + 10 + 10 + 10
= 10 $\times$ 4
= 40
a, 234 + 567 + 766 + 433
= (234 + 766) + (567 + 433)
= 1000 + 1000
= 2000
b, 2023 + 7602 - 1023 + 1398
= (2023 - 1023) + (7602 + 1398)
= 1000 + 9000
= 10000
c, 4789 - 2567 - 7433 + 5211
= (4789 + 5211) - (2567 + 7433)
= 10000 - 10000
= 0
d, 5 - 10 + 15 - 20 + 25 - 30 + 35 - 40 + 50 - 55 + 60 - 65 + 70
= (70 -65) + (60 - 55) +(50 - 40) + (35 - 30) + (25 - 20) + (15 - 10) + 5
= 5 + 5 + 10 + 5 + 5 + 5 + 5
= 5 x 6 + 10
= 40
12345 x 17 + 23 x 12345 + 12345 + 12345 x 35 + 12345 x 24
12345 x ( 17 + 23 + 35 + 24 )
12345 x 99
1222155
= 12345 x 17 + 23 x 12345 + 12345 x 1 + 12345 x 35 + 12345 x 24
= 12345 x ( 17 + 23 + 1 + 35 + 24 )
= 12345 x 100
= 1234500
567 x 23 + 433 x 23 = 23 x (567 + 433)
=23 x 1000 = 23 000