1.—3.14x3502+6.28x(—23.3)—1.57x36.4=__________2.计算(1+1/3+1/4)x(1/2+1/3+1/4+1/5)—(1+1/2+1/3+1/4+1/5)x(1/3+1/4)3.1+2—3—4+5+6—7—8+……+2009+2010—2011—2012=4.1x2x3+2x4x6+4x8x12+7x14x21/1x3x5+2x6x10+4x12x20+7x21x35=?
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![1.—3.14x3502+6.28x(—23.3)—1.57x36.4=__________2.计算(1+1/3+1/4)x(1/2+1/3+1/4+1/5)—(1+1/2+1/3+1/4+1/5)x(1/3+1/4)3.1+2—3—4+5+6—7—8+……+2009+2010—2011—2012=4.1x2x3+2x4x6+4x8x12+7x14x21/1x3x5+2x6x10+4x12x20+7x21x35=?](/uploads/image/z/12941236-28-6.jpg?t=1.%E2%80%943.14x3502%2B6.28x%28%E2%80%9423.3%29%E2%80%941.57x36.4%3D__________2.%E8%AE%A1%E7%AE%97%EF%BC%881%2B1%2F3%2B1%2F4%29x%281%2F2%2B1%2F3%2B1%2F4%2B1%2F5%29%E2%80%94%281%2B1%2F2%2B1%2F3%2B1%2F4%2B1%2F5%29x%281%2F3%2B1%2F4%293.1%2B2%E2%80%943%E2%80%944%2B5%2B6%E2%80%947%E2%80%948%2B%E2%80%A6%E2%80%A6%2B2009%2B2010%E2%80%942011%E2%80%942012%3D4.1x2x3%2B2x4x6%2B4x8x12%2B7x14x21%2F1x3x5%2B2x6x10%2B4x12x20%2B7x21x35%3D%3F)
1.—3.14x3502+6.28x(—23.3)—1.57x36.4=__________2.计算(1+1/3+1/4)x(1/2+1/3+1/4+1/5)—(1+1/2+1/3+1/4+1/5)x(1/3+1/4)3.1+2—3—4+5+6—7—8+……+2009+2010—2011—2012=4.1x2x3+2x4x6+4x8x12+7x14x21/1x3x5+2x6x10+4x12x20+7x21x35=?
1.—3.14x3502+6.28x(—23.3)—1.57x36.4=__________
2.计算(1+1/3+1/4)x(1/2+1/3+1/4+1/5)—(1+1/2+1/3+1/4+1/5)x(1/3+1/4)
3.1+2—3—4+5+6—7—8+……+2009+2010—2011—2012=
4.1x2x3+2x4x6+4x8x12+7x14x21/1x3x5+2x6x10+4x12x20+7x21x35=?
1.—3.14x3502+6.28x(—23.3)—1.57x36.4=__________2.计算(1+1/3+1/4)x(1/2+1/3+1/4+1/5)—(1+1/2+1/3+1/4+1/5)x(1/3+1/4)3.1+2—3—4+5+6—7—8+……+2009+2010—2011—2012=4.1x2x3+2x4x6+4x8x12+7x14x21/1x3x5+2x6x10+4x12x20+7x21x35=?
1.—3.14x35.2+6.28x(—23.3)—1.57x36.4=-3.14(35.2+23.3*2+36.4/2)=3.14*100=314
2.(1+1/3+1/4)x(1/2+1/3+1/4+1/5)—(1+1/2+1/3+1/4+1/5)x(1/3+1/4)=
(1/3+1/4)x(1/2+1/3+1/4+1/5)+(1/2+1/3+1/4+1/5)—[(1/2+1/3+1/4+1/5)x(1/3+1/4)+(1/3+1/4)]
=(1/2+1/3+1/4+1/5)—(1/3+1/4)=1/2+1/5=7/10
3.1+2—3—4+5+6—7—8+……+2009+2010—2011—2012=(1+2—3—4)+(5+6—7—8)+……(2009+2010—2011—2012)=-4*503=-2012
4.1x2x3+2x4x6+4x8x12+7x14x21/1x3x5+2x6x10+4x12x20+7x21x35
=1x2x3(1+8+7)/1x3x5(1+8+7)=2/5