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B1:
a) = (8/15 + 7/15) + (7/4 + 5/4)
= 15/15 + 12/4
= 1 + 3
= 4
b) = (16,88 + 3/12) + 9,76
= 20 + 9,76
= 29,76
c) = (17,16 + 82,84) + 72,84
= 100 + 72,84
= 172,84
B2:
2/3 + 4/5 = 10/15 + 12/15 = 22/15
a) \(\frac{8}{15}+\frac{7}{4}+\frac{7}{15}+\frac{5}{4}\)
\(=\left(\frac{8}{15}+\frac{7}{15}\right)+\left(\frac{7}{4}+\frac{5}{4}\right)\)
\(=\frac{15}{15}+\frac{12}{4}\)
\(=1+3=4\)
b) \(16,88+9,76+3,12\)
\(=\left(16,88+3,12\right)+9,76\)
\(=20+9,76=29,76\)
c) \(72,84+17,16+82,84\)
\(=\left(82,84+17,16\right)+72,84\)
\(=100+72,84=172,84\)
\(\frac{2}{3}+\frac{4}{5}=\frac{10}{15}+\frac{12}{15}=\frac{22}{15}\)
9976+865)+135=976+(865+135)=976+1000=1976
891+(799+109)=(891+109)+799=1000+799=1799
(2/5+1/9)+3/5=(2/5+3/5)+1/9=1+1/9=9/9+1/9=10/9
19/11+(8/13+3/11)=(19/11+3/11)+8/13=22/11+8/13=22/11+8/13=2+8/13=26/13+8/13=34/13
16.88+9.76+3.12=(16.88+3.12)+9.76=20+9.76=29.76
72.68+17.16+82.64=72.68+(17.16+82.64)=72.68+100=172.68
1)
2,35 x 10 = 23,5
2,35 x 0,1 = 0,235
62,8 x 100 = 6,280
62,8 x 0,01 = 0,628
2)
0,25 x 5,87 x 40
=(0,25 x 40) x 5,87
=10 x 5,87
=58,7
891 + (799 + 109)
=891 + 799 + 109
=(891 + 109) + 799
=1000 + 799
=1799
7,48 +7,48 x 99
=7,48 x 1 + 7,48 x 99
=7,48 x (1+99)
=7,48 x 100
=748
16,88 + 9,76 +3,12
=(16,88 + 3,12) + 9,76
=20 +9,76
=29,76
Chúc bạn học tốt!!!
A. 64 x 52 + 37 x 52 - 2 x 26
A = 64 x 52 + 37 x 52 - 1 x 52
A = 52 x ( 64 + 37 - 1 )
A = 52 x 100
A = 5200
B. 16,88 + 9,76 + 3,12
B = ( 16,88 + 3,12 ) + 9,76
B = 20 + 9,76
B = 29,76
20,06-12,37-7,63
=20,06-(12,37+7,63)
=20,06-20
=0,06
1,8x2,5x4
=1,8x(2,5x4)
=1,8x10
=18
1,8 x 2,5 x 4 20,6-12,37-7,63
=1,8 x (2,5 x 4) =20,6-(12,37+7,63)
=1,8 x 10 =20,6-20
=18. =0,6.
20,06 - 12,37 - 7,63 1,8 * 2,5 * 4
=20,06 - (12,37 + 7,63) =1,8 * (2,5 * 4)
=20,06 - 20 =1,8 * 10
=0,06 =18
cau cuoi nay ko biet lam
a)20,06 - 12,37 - 7,63
=20,06 - (12,37 + 7,63)
=20,06 - 20
=0,06
b)1,8*2,5*4
=1,8*(2,5*4)
=1,8*10
=18
c)9,76*25,5-7,76*15,5
=2*25,5+7,76*25,5-7,76*15,5
=2*25,5+7,76*(25,5-15,5)
=2*25,5+7,76*10
=51+77,6
=128,6
16,88 + 9,76 + 3,12
= (16,88 + 3,12) + 9,76
= 20 + 9,76
= 29,76