Tính:
100+300+400-500x2=???
Tính nhẩm:
a) 400 + 300 =
700 – 300 =
700 – 400 =
b) 500 + 40 =
540 – 40 =
540 – 500 =
c) 100 + 20 + 4 =
300 + 60 + 7 =
800 + 10 + 5 =
Học sinh nhẩm và ghi kết quả như sau:
a) 400 + 300 = 700
700 – 300 = 400
700 – 400 = 300
b) 500 + 40 = 540
540 – 40 = 500
540 – 500 = 40
c) 100 + 20 + 4 = 124
300 + 60 + 7 = 367
800 + 10 + 5 = 815
a) 400 + 300 = 700
700 – 300 = 400
700 – 400 = 300
b) 500 + 40 =540
540 – 40 =500
540 – 500 =40
c) 100 + 20 + 4 =124
300 + 60 + 7 =367
800 + 10 + 5 =815
100 + 100 + 200 + 200 + 300 + 300 + 400 + 400
Tính
300 + 400 x 2 + 100
300 + 400 x 2 + 100
= 300 + 800 + 100
= 1100 + 100
= 1200
300 + 400 x 2 + 100
= 300 + 800 + 100
= 1100 + 100
= 1200
tk mk nha
hihi <3
300+400x2+100=700x2+100
=1400+100
=15000
tính
100.200.300+100+200+300+400
1000.10.20.30.40
100.200.300 + 100 + 200 + 300 + 400 = 6000 000 + 1000 = 6001 000
1000 . 10.20.30.40 = 10 000 x 24 000 = 240 000 000
100+100+200+200+300+300+400+400+500+500+600+600+700+700+800+800+900+900+?
100+100+200+200+300+300+400+400+500+500+600+600+700+700+800 = 6400
Bài 1 : tính nhanh
a ) ( a - b ) - ( c - b ) -a
b ) - ( 300 - 400 ) + ( 300 - 400 ) + 100
bài 2 :tìm x biết
a ) 4x - 20 = 50 - ( 30 - 3x )
b ) 100 - ( - 5X ) = 40 - ( - 4x +10 )
c ) ( - 50 ) + ( - 7x ) = 100 - 8x
a) (a-b)-(c-b)-a=a-b-c+b-a=(a-a)+(b-b)-c=0+0-c=-c
1)
a) (a-b) - (c-b) - a= a - b - c + b - a = -c
b) -(300 - 400) + (300 - 400) + 100 = 100
2) a) 4x - 20 = 50 - ( 30 -3x)
4x - 20 = 50 - 30 + 3x
4x - 3x = 50 - 30 + 20= 40
x = 40
b) 100 - (-5x) = 40 - (-4x +10)
100 + 5x = 40 + 4x -10
5x - 4x = 40 - 10 -100
x = -70
c) (-50) + (-7x) = 100 - 8x
-7x + 8x = 100 + 50
x = 150
Bài 1.
a) \(\left(a-b\right)-\left(c-b\right)-a\)
\(=a-b-c+b-a\)
\(=\left(a-a\right)+\left(-b+b\right)-c\)
\(=-c\)
b)\(-\left(300-400\right)+\left(300-400\right)+100\)
\(=-300+400+300-400+100\)
\(=\left(-300+300\right)+\left(400-400\right)+100\)
\(=100\)
Bài 2.
a)\(4x-20=50-\left(30-3x\right)\)
\(\Leftrightarrow4x-20=50-30+3x\)
\(\Leftrightarrow4x-20=20+3x\)
\(\Leftrightarrow x=40\)
Vậy x = 40
b)\(100-\left(-5x\right)=40-\left(-4x+10\right)\)
\(\Leftrightarrow100+5x=40+4x-10\)
\(\Leftrightarrow x=-70\)
Vậy x = -70
c)\(\left(-50\right)+\left(-7x\right)=100-8x\)
\(\Leftrightarrow-50-7x=100-8x\)
\(\Leftrightarrow x=150\)
Vậy x = 150
Linz
Câu hỏi :
8+2+10+80+100+200+100+500x2+1000-1500=?
3 ng nhanh nhất nhé nhớ Trlời trên 3 dòng để lên SP nhé
8+2+10+80+100+200+100+500x2+1000-1500
= 1000
Hok tốt
:)
Câu hỏi :
8+2+10+80+100+200+100+500x2+1000-1500=?
Trả lời:
8+2+10+80+100+200+100+500x2+1000-1500 = 1000
Trả lời:
8+2+10+80+100+200+100+500x2+1000-1500=?
= 900
300 + 100 + 50 + 50 + 90 + 10 + 400 + 1000 = ????
Tính nhanh
100+200+300+400+500+600+700+800+900+100+200+300+400+500+600+700+800+900
1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111222222222222222222222222222222223333333333333333333333333333333333333333333333334444444444444444444444444444444444444455555555555555555556666666666666666677777777777777777777777777777777777777777777777778888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888
900000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000213131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313131313