help!要简算的.(1)1*2*3+2*4*6+7*14*21 (2)1*3*5+2*10+7*21*35
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help!要简算的.(1)1*2*3+2*4*6+7*14*21 (2)1*3*5+2*10+7*21*35
help!要简算的.
(1)1*2*3+2*4*6+7*14*21
(2)1*3*5+2*10+7*21*35
help!要简算的.(1)1*2*3+2*4*6+7*14*21 (2)1*3*5+2*10+7*21*35
1.
(1+2+7)(1*2*3)=60
2.
(1+2+7)(1*3*5)=150
1*2*3+2*4*6+7*14*21
=1*2*3+2*(1*2*3)+7*(1*2*3)
=(1+2+7)*1*2*3
=10*1*2*3
=60
1*3*5+2*6*10+7*21*35
=(1+2+7)*(1*3*5)
=10*1*3*5
=150
1*2*3+2*4*6+7*14*21
= 1*2*3+2*2*2*(1*2*3)+7*7*7*(1*2*3)
=1*2*3*(1+8+343)
=6*352
=2112
(2)1*3*5+2*6*10+7*21*35
=1*3*5+2*2*2*(1*3*5)+7*7*7*(1*3*5)
=1*3*5*(1+8+343)
=15*352
=5280
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