=\(70\left(\frac{121212}{565656}+\frac{121212}{727272}+\frac{121212}{909090}\right)\)
=\(70\left(\frac{3.40404}{14.40404}+\frac{121212}{6.121212}+\frac{2.60606}{15.60606}\right)\)
=\(70\left(\frac{3}{14}+\frac{1}{6}+\frac{2}{15}\right)\)
=\(70.\frac{18}{35}=38\)
Tính:\(C=70.\left(\frac{121212}{565656}+\frac{121212}{727272}+\frac{121212}{909090}\right)\)
tính tổng
A = 70 .[ 121212/565656 + 121212/727272 + 121212/909090
B = 191/210 + 161/240 +129/272 + 95/306
Tính nhanh
210.(111111/121212 +111111/202020+11111/303030 + 111111/424242 +111111/565656 +111111/727272 +111111/909090)
70.(131313/565656+131313/727272+131313/909090)
B=70.(131313/565656+131313/727272+131313/909090)
70.\(\left(\dfrac{131313}{565656}+\dfrac{131313}{727272}+\dfrac{131313}{909090}\right)\)
B= 70.( 131313/565656 + 131313/727272 + 131313/909090)
Tính B: Có cách làm !
tính
\(70\left(\frac{252525}{565656}+\frac{252525}{727272}+\frac{252525}{909090}\right)\)
B = 70.(\(\frac{131313}{565656}+\frac{131313}{727272}+\frac{131313}{909090}\))
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