78. 45 + 145. (- 78)
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x + 97 = 45 + 55
x + 97 = 100
x = 100 - 97
x = 3
145 - x = 78
x = 145 - 78
x = 67
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\(\frac{78}{78}< \frac{79}{78}\)
\(\frac{35}{145}>\frac{35}{175}\)
\(\frac{2017}{2018}< \frac{2018}{2019}\)
Hok tốt!
Ko chắc câu cuối nha~!
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21 765 - 4 x 25 + 75 = 21 765 - 100 + 75 = 21 740
125 x 4 - 25 + 3 619 = 125 x 3 598 = 449 750
145 - 45 : 9 + 32 = 145 - 5 + 32 = 172
145 x 78 + 22 x 145 + 145 = 145 x ( 78 + 22 ) + 145 = 145 x 100 + 145 = 14 500 +145 = 14 645
...
7x - 7 = 343 4 305 : 5x = 21
7x = 343 + 7 5x = 4 305 : 21
7x = 350 5x = 205
x = 350 : 7 x = 205 : 5
x = 50 x = 41
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tinh nhanh
70+50+30+50+26+97+3+74
=(70+30)+(50+50)+(97+3)+(74+26)
=100+100+100+100
=400
209-134
56+78=134
78+97=175
145-74=71
12+56-34+89=68-34+89=34+89=123
70+50+30+50+26+97+3+74=(70+30)+(50+50)+(26+74)+(97+3)=100+100+100+100=400
209-134=75
210-73=137
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m = 986 x 223 - 78/985 x 223 + 145
m = 223 x ( 986 - 78/985) + 145
m = 223 x \(\frac{971132}{985}\)+ 145
m = 219860,3411 + 145
m = 220005,3411
= 20210231313242424252525141
???