有奖问答,数学高手看下。
0.8888×10.4-0.1111×3.2=?(36963-369.63)÷(24642-246.42)=?(1+1.8)+(2+1.8×2)+(3+1.8×3)+……...
0.8888×10.4-0.1111×3.2=?
(36963-369.63)÷(24642-246.42)=?
(1+1.8)+(2+1.8×2)+(3+1.8×3)+……+(100+1.8×100)=?
(2.17+5.49+3.81)×(5.49+2.17+9.2)-(3.81+2.17+5.49+9.2)×(2.17+5.49)=?
递等式简便运算,小学五年级,越快越好,满意的再加20分。
要过程!!!!!!!!!!!
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(36963-369.63)÷(24642-246.42)=?
(1+1.8)+(2+1.8×2)+(3+1.8×3)+……+(100+1.8×100)=?
(2.17+5.49+3.81)×(5.49+2.17+9.2)-(3.81+2.17+5.49+9.2)×(2.17+5.49)=?
递等式简便运算,小学五年级,越快越好,满意的再加20分。
要过程!!!!!!!!!!!
四楼的没过程。 展开
4个回答
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0.8888×10.4-0.1111×3.2
=0.8888×10.4-0.1111×8×0.4
=0.8888×10.4-0.8888×0.4
=0.8888×(10.4-0.4)
=0.8888×10
=8.888
(36963-369.63)÷(24642-246.42)
=36963×(1-0.01)÷[24642×(1-0.01)]
=36963÷24642
=(12321×3)÷(12321×2)
=3÷2
=1.5
(1+1.8)+(2+1.8×2)+(3+1.8×3)+……+(100+1.8×100)
=(1+2+。。。+100)+1.8×(1+2+。。。+100)
=(1+100)×100÷2×(1+1.8)
=5050×2.8
=14140
(2.17+5.49+3.81)×(5.49+2.17+9.2)-(3.81+2.17+5.49+9.2)×(2.17+5.49)
设a=2.17+5.49+3.81
原式=a*(a+9.2-3.81)-(a+9.2)*(a-3.81)
=a*a+a*9.2-a*3.81-a*a-a*9.2+a*3.81+9.2*3.81
=9.2×3.81
=35.052
=0.8888×10.4-0.1111×8×0.4
=0.8888×10.4-0.8888×0.4
=0.8888×(10.4-0.4)
=0.8888×10
=8.888
(36963-369.63)÷(24642-246.42)
=36963×(1-0.01)÷[24642×(1-0.01)]
=36963÷24642
=(12321×3)÷(12321×2)
=3÷2
=1.5
(1+1.8)+(2+1.8×2)+(3+1.8×3)+……+(100+1.8×100)
=(1+2+。。。+100)+1.8×(1+2+。。。+100)
=(1+100)×100÷2×(1+1.8)
=5050×2.8
=14140
(2.17+5.49+3.81)×(5.49+2.17+9.2)-(3.81+2.17+5.49+9.2)×(2.17+5.49)
设a=2.17+5.49+3.81
原式=a*(a+9.2-3.81)-(a+9.2)*(a-3.81)
=a*a+a*9.2-a*3.81-a*a-a*9.2+a*3.81+9.2*3.81
=9.2×3.81
=35.052
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拿计算器算。
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8*0.1111*10.4-0.1111*3.2
=83.2*0.1111-0.1111*3.2
=(83.2-3.2)*0.1111
=80*0.1111
=8.888
(369.63*100-369.63)÷(246.42*100-246.42)
={369.63(100-1)}÷{246.42(100-1)}
=369.63÷246.42
=1.5
=83.2*0.1111-0.1111*3.2
=(83.2-3.2)*0.1111
=80*0.1111
=8.888
(369.63*100-369.63)÷(246.42*100-246.42)
={369.63(100-1)}÷{246.42(100-1)}
=369.63÷246.42
=1.5
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你好,答案如下:
[1] 8.888
[2] 1.5
[3] 14140 可以算出,第一个括号里是2.8,第二个是2个2.8,第三个是3个2.8,。。。一共是5050个2.8,所以最终是14140
[4]35.052
望采纳,谢谢!
[1] 8.888
[2] 1.5
[3] 14140 可以算出,第一个括号里是2.8,第二个是2个2.8,第三个是3个2.8,。。。一共是5050个2.8,所以最终是14140
[4]35.052
望采纳,谢谢!
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