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\(A=\frac{1}{2}×\frac{3}{4}+\frac{1}{4}×\frac{1}{2}\)
\(A=\frac{1}{2}×\left(\frac{3}{4}+\frac{1}{4}\right)\)
\(A=\frac{1}{2}×\left(\frac{3+1}{4}\right)\)
\(A=\frac{1}{2}×1\)
\(A=\frac{1}{2}\)
\(B=\frac{1212}{2121}×\frac{151515}{161616}\)
\(B=\frac{1212:101}{2121:101}×\frac{151515:10101}{161616:10101}\)
\(B=\frac{12}{21}×\frac{15}{16}\)
\(B=\frac{12×15}{21×16}\)
\(B=\frac{3×4×3×5}{3×7×4×4}\)
\(B=\frac{15}{28}\)
a, 12+18+24+30+36+42
=6.2+6.3+6.4+6.5+6.6+6.7
=6.(2+3+4+5+6+7)
=6.27
=162
b, mm+pp+xx+yy
=11.m+11.p+11.x+11.y
=11.(m+p+x+y)
c, 1212+2121+4242+2424
=12.101+21.101+42.101+24.101
=(12+21+42+24).101
=99.101
=9999
1212/2727 = 12/27 = 4/9 = 8/18
2525/5050 = 25/50 = 1/2 = 9/18
Vậy a bằng:
9/18 - 8/18 = 1/18
Nhớ K nha~
1212/2727 = 4/9
2525/5050 = 1/2
4/9 + a = 1/2
a = 1/2 - 4/9
a =1/18
\(15x\frac{2121}{4343}+15x\frac{222222}{434343}\)
\(=15x\frac{21}{43}+15x\frac{22}{43}\)
\(=15x\left(\frac{21}{43}+\frac{22}{43}\right)\)
\(=15x1\)
\(=15\)
= 15 x 21/43 + 15x 22/43
= 15 x (21/43 + 22/43)
= 15 x 1 =15
\(\frac{12x101x13x10101}{13x101x12x10101}=\frac{12x10101x13x101}{12x10101x13x101}=\frac{121212x1313}{121212x1313}=1.\)
`a)2018xx(1/2+1212/2424)`
`=2018xx(1/2+1/2)`
`=2018xx2/2=2018`
______________________________
`b)15xx2121/4343+15xx222222/434343`
`=15xx(2121/4343+222222/434343)`
`=15xx(21/43+22/43)`
`=15xx43/43=15`
1. \(\frac{12}{18}\)= \(\frac{2}{3}\)
\(\frac{22}{33}\)= \(\frac{2}{3}\)
\(\frac{1010}{1313}\)= \(\frac{10}{13}\)
\(\frac{27}{36}\)= \(\frac{3}{4}\)
\(\frac{202}{303}\)= \(\frac{2}{3}\)
\(\frac{1111}{1212}\)= \(\frac{11}{12}\)
2. a) 12 x \(\frac{1313}{13}\)x 1212
= 12 x \(\frac{13}{13}\)x 1212
1. \(\frac{12}{18}=\frac{2}{3}\): \(\frac{22}{33}=\frac{2}{3}\); \(\frac{1010}{1313}=\frac{10}{13}\); \(\frac{27}{36}=\frac{3}{4}\) ; \(\frac{202}{303}=\frac{2}{3}\);\(\frac{1111}{1212}=\frac{11}{12}\)
2 a)\(\frac{12X1313}{13X1212}=\frac{12X13X101}{13X12X101}=1\);b) \(\frac{1111X121212}{1212X111111}=\frac{11X101X12X10101}{12X101X11X10101}=1\)
1212+2121+4242+2424
=1212+2121+2121+2121+1212+1212
=(1212+2121)+(2121+1212)+(1212+2121)
=3333+3333+3333
=3333 x 3 =9999
1212+2121+4242+2424=
=3333+6666
=9999