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a, 4.7.25 + 2.6.5 = (4.25)7 + (2.5)6
= 100.7 + 10.6 = 700 + 60 = 760
b, 164.53 + 47.164 = 164( 53 + 47) = 164 . 100 = 16400
c, 427 + 354 + 373 + 246 + 155 = ( 427 + 373 ) + ( 354 + 246 ) + 155
= 800 + 600 + 155 = 1400 + 155 = 1555
d, 27.(13 + 5) + 18(59 + 14) = 27 . 18 + 18. 73
= 18(27 + 73) = 18. 100 = 1800
Chúc bạn học tốt! ~
59 : 54 = 1,0935
59 : 27 = 2,185
59 : 18 = 3,2777
59 : 9 = 6,5555
59 : 6 = 9,833
bn tính dư cho mik đc ko, tính dư ko phải số thập phân nhé, dù gì cũng cảm ơn bạn ĐÀO TRẦN TUẤN ANH
mình phân phối rồi nhưng rắc rối lắm, bn làm giúp mình 1 câu thôi nhé
ban hay su dung quy tac chuyen ve de pha ngoac sau do lay 73 +(-73) roi lan luot su dung tinh chat phan phoi se giai,
dap an 112
1+2+3+4+5+6+7+8+9+10=55
11+12+13+14+15+16+17+18+19+20=155
1+2+3+4+5+6+7+8+9+10+11+12+13+14 +15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30-50-53=362
Bài 1:
a; \(\dfrac{5}{18}\) + \(\dfrac{8}{19}\) - \(\dfrac{7}{21}\) + (- \(\dfrac{10}{36}\) + \(\dfrac{11}{19}\) + \(\dfrac{1}{3}\)) - \(\dfrac{5}{8}\)
= \(\dfrac{5}{18}\) + \(\dfrac{8}{19}\) - \(\dfrac{1}{3}\) -\(\dfrac{10}{36}\) + \(\dfrac{11}{19}\) + \(\dfrac{1}{3}\) - \(\dfrac{5}{8}\)
= (\(\dfrac{5}{18}\) - \(\dfrac{10}{36}\)) + (\(\dfrac{8}{19}\) + \(\dfrac{11}{19}\)) - (\(\dfrac{1}{3}\) - \(\dfrac{1}{3}\)) - \(\dfrac{5}{8}\)
= (\(\dfrac{5}{18}\) - \(\dfrac{5}{18}\)) + \(\dfrac{19}{19}\) - 0 - \(\dfrac{5}{8}\)
= 0 + 1 - \(\dfrac{5}{8}\)
= \(\dfrac{3}{8}\)
b; \(\dfrac{1}{13}\) + (\(\dfrac{-5}{18}\) - \(\dfrac{1}{13}\) + \(\dfrac{12}{17}\)) - (\(\dfrac{12}{17}\) - \(\dfrac{5}{18}\) + \(\dfrac{7}{5}\))
= \(\dfrac{1}{13}\) - \(\dfrac{5}{18}\) - \(\dfrac{1}{13}\) + \(\dfrac{12}{17}\) - \(\dfrac{12}{17}\) + \(\dfrac{5}{18}\) - \(\dfrac{7}{5}\)
= (\(\dfrac{1}{13}\) - \(\dfrac{1}{13}\)) + (\(\dfrac{12}{17}\) - \(\dfrac{12}{17}\)) + (-\(\dfrac{5}{18}\) + \(\dfrac{5}{18}\)) - \(\dfrac{7}{5}\)
= 0 + 0 + 0 - \(\dfrac{7}{5}\)
= - \(\dfrac{7}{5}\)
Bài 1 c;
\(\dfrac{15}{14}\) - (\(\dfrac{17}{23}\) - \(\dfrac{80}{87}\) + \(\dfrac{5}{4}\)) + (\(\dfrac{17}{23}\) - \(\dfrac{15}{14}\) + \(\dfrac{1}{4}\))
= \(\dfrac{15}{14}\) - \(\dfrac{17}{23}\) + \(\dfrac{80}{87}\) - \(\dfrac{5}{4}\) + \(\dfrac{17}{23}\) - \(\dfrac{15}{14}\) + \(\dfrac{1}{4}\)
= (\(\dfrac{15}{14}-\dfrac{15}{14}\)) + (\(-\dfrac{17}{23}+\dfrac{17}{23}\)) - (\(\dfrac{5}{4}\) - \(\dfrac{1}{4}\)) + \(\dfrac{80}{87}\)
= 0 + 0 - 1 + \(\dfrac{80}{87}\)
= - \(\dfrac{7}{87}\)
\(27\cdot\left(13+5\right)+18\cdot\left(59+14\right)\)
\(=27\cdot18+18\cdot73\)
\(=18\cdot\left(27+73\right)\)
\(=18\cdot100\)
\(=1800\)
\(27. \left(13+5\right)+18.\left(59+14\right)\)
\(=27.18+18.73\)
\(=18.\left(27+73\right)\)
\(=18.100\)
\(=1800\)