1.900000-9=________×99999 2.解1/3(12-X)+2X=12-X (写出过程)
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1.900000-9=________×999992.解1/3(12-X)+2X=12-X(写出过程)1.900000-9=________×999992.解1/3(12-X)+2X=12-X(写出过
1.900000-9=________×99999 2.解1/3(12-X)+2X=12-X (写出过程)
1.900000-9=________×99999 2.解1/3(12-X)+2X=12-X (写出过程)
1.900000-9=________×99999 2.解1/3(12-X)+2X=12-X (写出过程)
1.900000-9=899991;899991/99999=9.所以填9
2.等式两边都乘以3,即:(12-X)+6X=36-3X; 整理X项到等式左边,数到右边,有:8X=24.
即结果为x=3.
1
900000-9=___9_____×99999
左边提取9:
900000-9=9(100000-1)=9×99999
2
1/3(12-X)+2X=12-X
两边同时乘以3
12-x+6x=36-3x
8x=24
∴x=63
解1:
900000-9=(9)×99999
解2:
1/3(12-X)+2X=12-X
4-X/3+2X=12-X
4+5X/3=12-X
4+5X/3-4+X=12-X-4+X
5X/3+X=12-4
8X/3=8
(8X/3)×(3/8)=8×(3/8)
X=3
1+3+9+27+81+.+6561=________
数词专项练习(一)一、 写出下列基数词和序数词.1________ ________ 2________ _______ 3________ ________ 5_______ _______ 9________ ________ 11________ ___ __12________ ________ 13________ ________ 20________ ________ 71________ __
1.900000-9=________×99999 2.解1/3(12-X)+2X=12-X (写出过程)
解1/3(12-X)+2X=12-X 900000-9=________×99999 (写出过程)1.900000-9=________×999992.解1/3(12-X)+2X=12-X
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