5 + 5 + 10 + 90 - 10 =?
>; <; =?
a) 5 760 ? 5 699 7 849 ? 8 700
b) 9 999 ? 10 001 10 100 ? 10 080
c) 74 685 ? 74 685 90 537 ? 90 357
a) 5760 > 5699
7849 < 8700
b) 9999 < 10001
10100 > 10080
c) 74685 = 74685
90537 > 90357
Tính nhẩm:
80 + 10 = 30 + 40 = 80 + 5 =
90 - 80 = 70 - 30 = 85 - 5 =
90 - 10 = 70 - 40 = 85 - 80 =
80 + 10 = 90 30 + 40 = 70 80 + 5 = 85
90 - 80 = 10 70 - 30 = 40 85 - 5 = 80
90 - 10 = 80 70 - 40 = 30 85 - 80 = 5
80+10=90 30+40=70 80+5=85
90-80=10 70-30=40 85-5=80
90-10=80 70-40=30 85-80=5
80 + 10 = 90 30 + 40 = 70 80 + 5 = 85
90 - 80 = 10 70 + 30 = 90 85 - 5 = 80
90 - 10 = 80 70 - 40 = 30 85 - 80 = 5
Tính giá trị của biểu thức:
a) 90 – ( 30 – 20) = ..........................
= ..........................
90 – 30 – 20 = ..........................
= ..........................
b) 100 – (60 + 10) = ..........................
= ..........................
100 - 60 + 10 = ..........................
= ..........................
c) 135 – (30 + 5) = ..........................
= ..........................
135 – 30 – 5 = ..........................
= ..........................
d) 70 + (40 – 10) = ..........................
= ..........................
70 + 40 – 10 = ..........................
= ..........................
a) 90 – ( 30 – 20) = 90 – 10
= 80
90 – 30 – 20 = 60 - 20
= 40
b) 100 – (60 + 10) = 100 – 70
= 30
100 - 60 + 10 = 40 + 10
= 50
c) 135 – (30 + 5) = 135 – 35
= 100
135 – 30 – 5 = 105 – 5
= 100
d) 70 + (40 – 10) = 70 + 30
= 100
70 + 40 – 10 = 110 -10
= 100
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nguuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu
5*10*90+90+90=?
5*10*90+90+90
=50*90+90+90
=4500+90+90
=4590+90
=4680
5*10*90+90+90
=50*90+2*90
=90*(50+2)
=90*52
=4680
(90 - 10 + 5 - 5) : 2= ?
( 90 - 10 + 5 - 5 ) : 2
= ( 80 + 5 - 5 ) : 2
= ( 80 + 0 ) : 2
= 80 : 2
= 40
(90-10+5-5):2
= (80+5-5):2
= (85-5):2
= 80:2
=40
Ủng hộ mik nhé, Kẹo bông ngọt ngào
1+1+2+3+4+5+6+7+8+9+10+10+10+10+80+90=?
1 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 10 + 10 + 10 + 80 + 90
= ( 1 + 5 ) + ( 1 + 9 ) + ( 2 + 8 ) + ( 3 + 7 ) + ( 4 + 6 ) + ( 10 + 90 ) + ( 10 + 10 + 80 ) + 10
= 6 + 10 + 10 + 10 +10 + 100 + 100 + 10
= 16 + 10 + 10 + 10 + 100 + 100 + 10
= 26 + 10 + 10 + 100 + 100 + 10
= 36 + 10 + 100 + 100 + 10
= 46 + 100 + 100 + 10
= 146 + 100 + 10
= 246 + 10
= 256
Chúc bạn hok tốt !
tính bằng cách thuận tiện nhất , giải bằng 2 cách khác nhau
10 x 5 + 5 x 10
50 + 10 + 90 + 50 + 30 + 60 + 10 + 70 + 50 + 50
10 x 5 + 5 x 10
c1 : 10 x (5 + 5)
= 10 x 10
= 100
c2 : (10 + 10) x 5
= 20 x 5
= 100
50 + 10 + 90 + 50 + 30 + 60 + 10 + 70 + 50 + 50
c1 : (50 + 50) + (10 + 90) + (30 + 60 + 10) + (50 + 50) + 70
= 100 + 100 + 100 + 100 + 70
= 100 x 4 + 70
= 400 + 70
= 470
c2: 50 x 4 + (10 + 90) + (70 + 30) + (60 + 10)
= 200 + 100 + 100 + 70
= 200 + 100 x 2 + 70
= 200 + 200 + 70
= 200 x 2 + 70
= 400 + 70 = 470
Mẫu: 60 : 20 = ( 60 : 10 ) : ( 20 : 10 ) = 6 :2 = 3
A) 75 : 25 = ( 75 : ..... ) : ( 25 : 5 ) = ..........................................................
B) 90 : 18 = ( 90 : ..... ) : ( 18 : 9 ) = ..........................................................
A) 75 : 25 = ( 75 : 5 ) : ( 25 : 5 ) = 15 : 5 = 3
B) 90 : 18 = ( 90 : 18 ) : ( 18 : 18 ) = 5 : 1 = 5
A) vì hai số đều chia hết cho 5 cho nên lấy hai số chia 5 ra kết quả bao nhiêu thì lấy hai số đó chia cho nhau
B) vì hai số đều chia hết cho 18 cho nên lấy hai số chia 18 ra kêt quả bao nhiêu thì lấy hai số chia cho nhau
Tìm x :
5 + 10 = 30 - x
10 + 40 = 90 - x
a)5+10=30-x
=>15=30-x
=>x=30-15
=>x=15
b)10+40=90-x
=>50=90-x
=>x=90-50
=>x=40
\(5+10=30-x\)
\(15=30-x\)
\(x=15\)
\(10+40=90-x\)
\(50=90-x\)
\(x=40\)
5 + 10 = 30 - x
15 = 30 - x
30 - x = 15 ( đổi vế )
x = 30 - 15
x = 15
10 + 40 = 90 - x
50 = 90 - x
90 - x = 50 ( đổi vế )
x = 90 - 50
x = 40
nha bn