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\(32\times25+18\times100-50\times12\)
\(=800+1800-600\)
\(=2000\)
\(56\times45+28\times98+56\times6\)
\(=2520+2744+336\)
\(=5600\)
32 x 25 + 18 x 100 - 50 x 12 = 32 x 25 + 18 x 4 x 25 - 25 x 2 x 12
= 32 x 25 + 72 x 25 - 25 x 24
= ( 32 + 72 - 24 ) x 25
= 80 x 25
= 2000
56 x 45 + 28 x 98 + 56 x 6 = 56 x 45 + 28 x 2 x 49 + 56 x 6
= 56 x 45 + 56 x 49 + 56 x 6
= 56 x ( 45 + 49 + 6 )
= 56 x 100
= 5600
2 x 4 x 6 x 8 x 50 x 25 x 125
= (2 x 50 ) x ( 4 x 25 ) x ( 125 x 8 ) x 6
= 100 x 100 x 1000 x 6
= 60000000
a, 25*5*13*4=6500
87*125*8*4=348000
b,50*76*2=7600
19*4*25*8=15200
c,303*20*6*5=181800
4*889*25=88900
d, X/8*32+X/3*18-X/5*10=120
X*32/8+X*18/3-X*10/5=120
32X/8+18X/3-10X/5=120
4X+6X-2X=120
8X=120
X=120/8
X=15
a) \(\frac{27.45+55.27}{2+4+6+8+...+16+18}=\frac{27.\left(45+55\right)}{\left(2+18\right)+\left(16+4\right)+\left(14+6\right)+\left(12+8\right)}\)
\(=\frac{27.100}{20+20+20+20}=\frac{2700}{20.4}=\frac{2700}{80}=\frac{135}{4}\)
b) Lười
Làm giống câu a nhé
11/15 + 8/5= Tính phân số
6/7 - 5/21=
25/4 x 16/100
7 x 2/49 =
4/3 : 2/9
5/8 : 25 =
25 x 9 x 4 - 50 x 2 x 6 + 100
= 100 x 9 - 100 x 6 + 100
= 100 x ( 9 - 6 + 1 )
= 100 x 4 = 400
25 x 9 x 4 - 50 x 2 x 6 + 100
= ( 25 x 4 ) x 9 - ( 50 x 2 ) x 6 + 100
a, \(\left(\frac{4}{9}.\frac{3}{7}\right).\frac{7}{4}=\frac{4}{9}\left(\frac{3}{7}.\frac{7}{4}\right)=\frac{4}{9}.\frac{3}{4}=\frac{3}{9}=\frac{1}{3}\)
b, \(\left(\frac{6}{5}.\frac{4}{5}\right).\frac{25}{16}=\frac{6}{5}\left(\frac{4}{5}.\frac{25}{16}\right)=\frac{6}{5}.\frac{5}{4}=\frac{6}{4}=\frac{3}{2}\)
c, \(\left(\frac{7}{8}.\frac{16}{9}\right).\frac{3}{14}=\frac{7}{8}\left(\frac{16}{9}.\frac{3}{14}\right)=\frac{7}{8}.\frac{8}{21}=\frac{7}{21}=\frac{1}{3}\)
a, (49.37).74=49(37.74)=49.34=39=13(49.37).74=49(37.74)=49.34=39=13
b, (65.45).2516=65(45.2516)=65.54=64=32(65.45).2516=65(45.2516)=65.54=64=32
c, (78.169).314=78(169.314)=78.821=721=13(78.169).314=78(169.314)=78.821=721=13
Nếu đúng thì k cho mình nhé bạn!
\(\frac{25x4x32+16x2x50}{100x6x8x2}=\frac{100x16x2+16x100}{100x6x16}=\frac{100x16\left(2+1\right)}{100x16x6}=\frac{3}{6}=\frac{1}{2}.\)
~~ học tốt nhé ~~~
25 x 4 x 32 + 16 x 2 x 50 =321600
100 x 6 x 8 x2 =14400
hok tốt