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(8+a)*3=34+a怎么算啊?谢谢

发布时间:2019-09-17

解:原式=3.8÷0.04×0.06
=3.8÷0.04÷100×0.06×100
=3.8÷4×6
=(3.8×6)÷4
=(1.7×3)×4÷4
=5.1

回复:

/1*2+1/2*3+1/3*4+1/4*5……1/199*200=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+ ....+(1/199-1/200)
=1-1/200(裂项相消法)

回复:

等于 1-1/2+1/2-1/3+1/3-1/4+.........+1/199-1/200=1-1/200=199/200

回复:

1/1*2+1/2*3+1/3*4+1/4*5……1/199*200
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+ ....+(1/199-1/200)
=1-1/200
=199/200

回复:

3.8÷(1-0.96)x0.06
=3.8÷0.04x0.06
=3.8x(0.06÷0.04)
=3.8x1.5
=5.7

回复:

1/1*2+1/2*3+1/3*4+1/4*5……1/199*200 =(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+ ....+(1/199-1/200) =1-1/200 =199/200

回复:

1*1!+2*2!+3*3!+...+10*10! = 1*1!+2*2!+3*3!+...+10*10! +(1!+2!+3!+...+10!) -(1!+2!+3!+...+10!) =2*1! +3*2!+4*3!+...+10*9!+11*10! -(1!+2!+3!+...+10!) =2!+3!+4!+...+10!+11! -(1!+2!+3!+...+10!) =11! -1

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