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\(a,21-22+23-24=-1+\left(-1\right)=-2\\ b,125-\left(115-99\right)=125-115+99=10+99=109\)
a) 21 - 22 + 23 - 24
= (21 + 23) + (-22 - 24)
= 44 - 46
= -2
b) 125 - (115 - 99)
= 125 - 115 + 99
= 10 + 99
= 109
a) 21 - 22 + 23 - 24
= (21 - 22) + (23 - 24)
= (-1) + (-1) = -2
b) 125 - (115 - 99)
= 125 - 115 + 99
= (125 - 115) + 99
= 10 + 99 = 109.
(\(\frac{15}{22}\)-\(\frac{7}{13}\)) x \(\frac{13}{7}\)- \(\frac{15}{22}\) x(\(\frac{6}{7}\)- \(\frac{22}{15}\))
=(\(\frac{15}{22}\)x \(\frac{13}{7}\)- 1) - \(\frac{15}{22}\)x\(\frac{6}{7}\)-1
=\(\frac{15}{22}\)x \(\frac{13}{7}\)-\(\frac{15}{22}\)x\(\frac{6}{7}\)(vì -1+1=0)
=\(\frac{15}{22}\)x(\(\frac{13}{7}\)-\(\frac{6}{7}\))
=\(\frac{15}{22}\)
làm hơi tắt nha
\(\left(\frac{15}{22}-\frac{7}{13}\right).\frac{13}{7}-\frac{15}{22}.\left(\frac{6}{7}-\frac{22}{15}\right)\)
\(=\frac{15}{22}.\frac{13}{7}-\frac{7}{13}.\frac{13}{7}-\frac{15}{22}.\frac{6}{7}+\frac{15}{22}.\frac{22}{15}\)
\(=\frac{15}{22}.\left(\frac{13}{7}-\frac{6}{7}\right)-1+1\)
\(=\frac{15}{22}.1-1+1\)
\(=\frac{15}{22}-\left(1-1\right)\)
\(=\frac{15}{22}-0\)
\(=\frac{15}{22}\)
\(a.21-22+23-24\)
\(=\left(-1\right)+\left(-1\right)=-2\)
\(b.125-\left(115-99\right)\)
\(=125-16=109\)
=3/22-(7/15+3/22)+7/15-1/2
=3/22-7/15-3/22+7/15-1/2
=(3/22-3/22)+(7/15-7/15)-1/2
=0+0-1/2
=-1/2
22 . (-115) + 15.22 - 202.4
= 4.(-115) + 15.4 - 808
= (-460) + 60 - 808
= (-400) - 808
= (-1208)
2².(-115) + 15.2² - 202.4
= 4.(-115) + 4.15 - 202.4
= 4.(-115 + 15 - 202)
= 4.(-302)
= -1208