简便计算
12x35 85x5x4 15x24 4x8x25 25x（24+56） 84x125x8 5x（28x4）
12x35
ï¼6Ãï¼2Ã35ï¼
=6Ã70
=420
85x5x4
15x24
=15Ã4Ã6
=60Ã60
=360
4x8x25
=4Ã25Ã8
=100Ã8
=800
25xï¼24+56ï¼
=25Ã80
=25Ã4Ã20
=100Ã20
=2000
84x125x8
=84xï¼125x8 ï¼
=84x1000
=84000
5xï¼28x4ï¼
=5Ã4Ã28
=20Ã28
=560
ï¼6Ãï¼2Ã35ï¼
=6Ã70
=420
85x5x4
15x24
=15Ã4Ã6
=60Ã60
=360
4x8x25
=4Ã25Ã8
=100Ã8
=800
25xï¼24+56ï¼
=25Ã80
=25Ã4Ã20
=100Ã20
=2000
84x125x8
=84xï¼125x8 ï¼
=84x1000
=84000
5xï¼28x4ï¼
=5Ã4Ã28
=20Ã28
=560
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第1个回答 2017-08-08
12x35=6x2x5x7=6x（2x5）x7=6x7x（2x5）=42x10=420
85x5x4=17x5x5x4=17x（5x5x4）=17x100=1700
15x24=5x3x2x12=（5x2）x（3x12）=10x36=360
4x8x25=8x4x25=8x（4x25）=8x100=800
25x（24+56）=25x80=25x4x20=100x20=2000
84x125x8=84x(125x8)=84x1000=84000
5x（28x4）= 5x（28x4）=5x4x28=20x28=560
85x5x4=17x5x5x4=17x（5x5x4）=17x100=1700
15x24=5x3x2x12=（5x2）x（3x12）=10x36=360
4x8x25=8x4x25=8x（4x25）=8x100=800
25x（24+56）=25x80=25x4x20=100x20=2000
84x125x8=84x(125x8)=84x1000=84000
5x（28x4）= 5x（28x4）=5x4x28=20x28=560
