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a. 3/5 x 5 + 12 x 3/5 + 3 : 5/3
= 3/5 x 5 + 12 x 3/5 + 3 x 3/5
= 3/5 x ( 5 + 15 + 3)
= 3/5 x 20
= 12
b. 3/5 x 45/27 x 135/180
= 3/5 x 5/3 x 3/4
= 1 x 3/4
= 3/4
a 180 -(x + 15) : 4 =80:5 180 - (x + 15) : 4 = 16 180 - ( x + 15) = 16 x 4 180 - ( x + 15 ) = 64 x + 15 = 180 - 64 x + 15 = 116 x= 116 - 15 x = 101
4 x 7 = 28
3 x 5 = 15
9 x 2 = 18
12 x 34 x 56 x 47 x 198 = 212623488
ủng hộ nhé~~
( x+16) : x * 12 = 240 - 180 = 60
( x+16) : x = 60 : 12 = 5
x + 16 = 5 * x = (1 + 4) * x = x + (4 * x)
16 = 4 * x
x = 16 : 4 = 4
\(\dfrac{5}{12}+\dfrac{1}{6}=\dfrac{5}{12}+\dfrac{2}{12}=\dfrac{5+2}{12}=\dfrac{7}{12}\)
\(\dfrac{5}{12}+\dfrac{1}{6}=\dfrac{5}{12}+\dfrac{2}{12}=\dfrac{7}{12}\)
\(1-\dfrac{23}{47}=\dfrac{47}{47}-\dfrac{23}{47}=\dfrac{24}{47}\)
\(\dfrac{4}{5}x\dfrac{7}{8}=\dfrac{4x7}{5x8}=\dfrac{28}{40}=\dfrac{7}{10}\)
\(\dfrac{8}{5}:\dfrac{1}{4}=\dfrac{8}{5}x\dfrac{4}{1}=\dfrac{32}{5}\)
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
Bài 1: x - 12 = 36
x = 36 + 12
x=48
x * 3 = 25
x= 25 : 3
x = 25/3
x + 123 = 96
(lớp 4 chưa học số Âm)
x : 12 = 72
x= 72 x 12
x=864
Bài 2 :
14 + 65 x 12
= 14 + 780
= 794
47 + 44 : 2
= 47 + 22
= 69
589 : 5 x 2
(chưa học số thập phân)
Bài 1:
a)x-12=36
x =36+12
x =48
b) x*3=25
x =25:3
x =25/3
c) x+123=96
x =96-123
x =-27
d) x:12=72
x =72x12
x =864
Bài 2:
14+65x12=14+780=794
47+44:2=47+22=69
598:5x2=119,6x2=239,2
k nha mọi người
98775 - 32 x 85
=98775 -2720
=96055
67500 - 24 x 236
= 67500 -5664
=61836
568 + 101598 : 287
= 568 +354
=922
6875 + 980 -180
=7855 -180
=7675
\(\dfrac{2}{5}+\dfrac{3}{10}-\dfrac{1}{2}\)
\(=\dfrac{7}{10}-\dfrac{1}{2}\)
= \(\dfrac{1}{5}\)
\(\dfrac{8}{11}+\dfrac{8}{33}x\dfrac{3}{4}\)
\(=\dfrac{8}{11}+\dfrac{2}{11}\)
\(=\dfrac{10}{11}\)
\(\dfrac{7}{9}x\dfrac{3}{14}:\dfrac{5}{8}\)
\(=\dfrac{1}{6}:\dfrac{5}{8}\)
\(=\dfrac{1}{6}x\dfrac{8}{5}\)
\(=\dfrac{8}{30}\)
\(=\dfrac{4}{15}\)
\(\dfrac{5}{12}-\dfrac{7}{32}:\dfrac{21}{16}\)
\(=\dfrac{5}{12}-\dfrac{7}{32}x\dfrac{16}{21}\)
\(=\dfrac{5}{12}-\dfrac{1}{6}\)
\(=\dfrac{5}{12}-\dfrac{2}{12}\)
\(=\dfrac{3}{12}=\dfrac{1}{4}\)
= 30168
9864 + 47 x ( 180 x 12 : 5)
= 9864 + 47 x ( 2160 : 5 )
= 9864 + 47 x 432
= 9864 + 20304
= 30168