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a) = 324 + 6 + 64 x 10
= 324 + 6 + 640
= 330 + 640
= 970 ( vì nhân chia trước cộng trừ sau )
b) = ( 2000 - 333 x 2 ) : ( 333 - 111 x 3 )
= ( 2000 - 333 x 2 ) : ( 333 - 333 )
= 0 ( vì số nào nhân với 0 đều bằng 0 )
c) = ( 666 - 666 ) : ( 150 - 50 x 2 )
= 0 ( vì 0 chia cho số nào cũng bằng 0 )
tk mk nha bạn !
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a)
2000 × 4 × 5 = 8000 × 5 = 40 000
36 000 : 6 : 2 = 6000 : 2 = 3000
30 000 : 3 x 2 = 10 000 x 2 = 20 000
b)
20 000 × (10 : 5) = 20 000 × 2 = 40 000
80 000 : (2 × 4) = 80 000 : 8 = 10 000
15 000 : (27 : 9) = 15 000 : 3 = 5000
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1)240x15-80x6x3-60x4
=240x15-80x3x6-240x1
=240x15-240x6-240x1
=240x(15-6-1)
=240x8
=1920
2)150x5x3x6-15x11
150x5x6x3-15x10-150x0,2
=150x5x6x3-150x1-150x0,2
=150x(5+6+3-1-0,2)
=150x12,8
=1980
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Tính :
A = 1 + 2 + 3 + 4 + 5 + 5 + 6 + 7 + 8 + 9 + 10
A = ( 1 + 9 ) + ( 2 + 8 ) + ( 3 + 7 ) + ( 4 + 6 ) + ( 5 + 5 ) + 10
A = 10 + 10 + 10 + 10 + 10 + 10
A = 60
B = 10 + 20 + 30 + 40 + 50 + 50 + 60 + 70 + 80 + 90 + 100
B = ( 10 + 90 ) + ( 20 + 80 ) + ( 30 + 70 ) + ( 40 + 60 ) + ( 50 + 50 ) + 100
B = 100 + 100 + 100 + 100 + 100 + 100
B = 600
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1x1+3x3+5x5+7x7+9x9
=1+9+25+49+81
=165
2x2+4x4+6x6+8x8
=4+16+36+64
=120
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5 x 5 + 4 x 5
= 5 x ( 5 + 4 )
= 5 x 9
= 45
6 x 9 + 5 x 9
= 9 x ( 6 + 5 )
= 9 x 11
= 99
80 x 5 + 333 : 9 + 6
= 400 + 37 + 6
= 437 + 6
= 443
(nhân chia trước, cộng trừ sau)
~hc tốt~