小六數...急急急THZ

1. ( 3 + 3 + 3 ) x 10 x 3 - ( 3 x 3 x 4 ) - ( 3 x 3 x 4 )
= ( 9 x 10 x 3 ) - ( 3 x 3 x 4 ) - ( 3 x 3 x 4 )
= 270 - 36 - 36
= 198

2. ( 3 x 10 x 8 ) - < ( 8 - 2 ) x 3 x ( 6 - 2 - 2 ) > - < ( 10 - 6 ) x ( 8 - 2 ) x 3 >
= ( 3 x 10 x 8 ) - ( 6 x 3 x 2 ) - ( 4 x 6 x 3 )
= 240 - 36 - 72
= 132

3. ( 14 + 14 + 21 ) x 20 x 15
= 49 x 20 x 15
= 14700

4. ( 5 x 5 x 14 ) + < ( 5 + 5 ) x 5 x 14 > + < ( 5 + 5 + 5 ) x 5 x 14 >
= ( 5 x 5 x 14 ) + ( 10 x 5 x 14 ) + ( 15 x 50 x 14 )
= 350 + 700 + 1050
= 2100

5. < ( 7+ 3 ) x 12 x 14 > - < ( 14 - 3 - 3 ) x 7 x ( 12 - 3 ) >
= ( 10 x 12 x 14 ) - ( 8 x 7 x 9 )
= 1680 - 504
= 1176

1)
10*3*(3+3+3)-3*3*4*2
=270-72
=198cm^3

2)
14*12*(3+7)-(14-3-3)*(12-3)*7
=1680-504
=1176cm^3

3)15*20*(14+21+14)-7*21*15
=14700-2205
=12495cm^3

4)
5*5*14+5*10*14+5*15*14
=350+700+1050
=2100cm^3

5)
8*3*10-(8-2)*3*(10-6)-3*(8-2-2)*(6-2-2)
=240-72-24
=144cm^3

1.係果個 H 字..
[10x(3+3+3)-3x4-3x4]x3
=(90-12-12)x3
=66x3
=198(cm3)

2.係 P 字
(10x8-2x4-6x4)x3
=(80-8-24)x3
=48x3
=144(cm3)

3.係 U 咁樣ge
(49x20-7x21)x15
=(980-147)x15
=833x15
=12485(cm3)

4.梯
一個長方體的體積是:
14x5x5
=350(cm3)
六個長方體的體積是:
350x6
=2100(cm3)

5.
(10x12x14)-(7x8x9)
=1680-504
=1176(cm3)

希望幫到你~