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5X7X44简便计算
简便计算
:9.99
x
22.2+33.3x3.34 1/3+1/15+1/35+1/63+1/99+1/143_百度...
答:
解由9.99x22.2+33.3x3.34 =99.9x2.22+33.3x3.34 =33.3×3x2.22+33.3x3.34 =33.3×6.66+33.3x3.34 =33.3(6.66+3.34 )=33.3×10 =333 2 1/3+1/15+1/35+1/63+1/99+1/143 =1/2(1/1-1/3)+1/2(1/3-1/5)+1/2(1/5-1/7)+1/2(1/7-1/9)+1/2...
3
5x
[(609-511)+29]
简便计算
怎么写?
答:
观察等式,既不能凑整数,也没有公式可以套,所以直接
计算
就是最
简便
的写发 35x[(609-511)+29]=35x127 =4445 如果不想计算35x127,可以把35看成5x7然后就是一步步算
5x7x
127可以直接口算了
6.3×3/14×4/7
简便计算
?
答:
你好,依题意可得,6.3x3/14x4/7 =63/10x3/14x4/7 =(63x3x4)/(10x14x7)=(
7x
3x3x2x2)/(5x2x2x
7x
7)=(3x3)/(
5x7
)=9/35 希望我的回答能帮到你。
简便计算
:9.99
x
22.2+33.3x3.34 1/3+1/15+1/35+1/63+1/99+1/143_百度...
答:
简便计算
:9.99x22.2+33.3x3.34 1/3+1/15+1/35+1/63+1/99+1/143 9.99x22.2+33.3x3.34 =0.3x33.3x22.2+33.3x3.34 =33.3x(0.3x22.2+3.34) =33.3x(6.66+3.34) =33.3x10 =333 1/3+1/15+1/35+1/63+1/99+1/143 =1/3+1/(3x5)+1/(
5x7
)+1...
1260÷[(35一29)
x
35]能
简便计算
吗?
答:
=1260÷[6x35]=1260÷210=6(直接
算
也很
简便
)
棣栭〉
<涓婁竴椤
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