Question

下面题目怎么巧算？

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Answer 1

56.7×23.4-567×1.26-108×4.67
=56.7×23.4-12.6×56.7-10.8×56.7+10.8×10
=56.7×(23.4-12.6-10.8)+108
=56.7×0+108
=108

追答

(380+521×1995)/(1996×521-141)-1/181
=(380+521×1995)/(1995×521+521-141)-1/181
=(380+521×1995)/(1996×521+380)-1/181
=1-1/181
=180/181

999平方+1999
=999平方+999+1000
=999×(999+1)+1000
=999000+1000
=1000000

提高卷1
原式=100+300+500+700+900+56×5+0.47×5
=2500+280+2.35
=2782.35

提高卷2
原式
=10×91+91+209×1000-209×2+627
=910+91+209000-418+627
=1001+209000+209
=210210

第三张
原式
=(30/7+24/11)÷(10/7+8/11)
=3×(10/7+8/11)÷(10/7+8/11)
=3

Answer 2

=56.7×23.4+56.7×10×1.26+108×4.67
=56.7×（23.4+12.6）+108×4.67
=56.7×36+36×3×4.67
=36×（56.7+14.01）
=36×70.71
=2545.56

Answer 3

都化成分式

Answer 4

56.7×23.4-567×1.26-108×4.67
=56.7×（23.4-12.6）-108×4.67
=10.8×（56.7-46.7）
=108
（380+521×1995）/（1996×521-141）-1/181
=（1996×521-141）/（1996×521-141）-1/181
=180/181
156.47+356.47+556.47+756.47+956.47
=56.47×5+100+300+500+700+900
=556.47×5
=2782.35
11×91+209×998+627
=1001+209×（1000-2+3）
=1001×（209+1）
=210210
（4+2/7+2+4/11）÷（1+3/7+8/11）
=（330+308）/（110+56）
=638/166
=319/83