数学题:0.89×100.1用简便计算
数学题:0.89×100.1用简便计算
=0.89x(100+0.1)
=0.89x100+0.89x0.1
=89+0.089
=89.089
简便计算 数学题
1/1*3+1/3*5+1/5*7+……+1/99*101
=1/2*(1-1/3)+1/2*(1/3-1/5)+...+1/2(1/99-1/101)
=1/2*(1-1/3+1/3-1/5+...+1/99-1/101)
=1/2*(1-1/101)
=1/2*100/101
=50/101
1/2+3/4+7/8+15/16+31/32+63/64+127/128
=1+1/4+7/8+15/16+31/32+63/64+127/128
=2+1/8+15/16+31/32+63/64+127/128
=3+11/16+31/32+63/64+127/128
=4+1/32+63/64+127/128
=5+1/64+127/128
=6+1/128
数学题 简便计算
101×99
=(100+1)(100-1)
=100²-1²
=10000-1
=9999
数学题目简便计算
2.02*8.5简便演算法
2.02*8.5
=(2+0.02)*8.5
=2*8.5+0.02*8.5
=17+0.17
=17.17
数学题:简便计算:54.6乘4.9
54.6x4.9
=54.6x(5-0.1)
=54.6x5-54.6x0.1
=273-5.46
=(272-5)+(1-0.46)
=267+0.54
=267.54
请问数学题?(简便计算)
(19+1/17)*7/18=(18+1+1/17)*7/18=(18+18/17)*7/18=18*7/18+18/17*7/18=7+7/17=7又7/17
1/(13/26又26/29)= 1/[13/(26*29+26)/29]=1/(13/26*30/29)=1/(13*29/26*30)=26*30/13*29=60/29
一道数学题(简便计算)
4/9+8/9+5/10
=(4/9+8/9)+1/2
=4/3+1/2
=11/6
几道数学题,计算的有简便计算就简便计算
14÷5/6×3/28 x-3/4=1/8
=14×6/5×3/28 解:(1-3/4)x=1/8
=14×3/28×6/5 1/4x=1/8
=3/2×6/5 1/4x÷1/4=1/8×4
=9/5 x=1/2
咱是第一个回答的,给我加分哦~~
数学题目能简便就简便计算
第一个普通的运算应该就行,
第二个,原式=(1-1/2)+(1/2-1/4)+(1/4-1/8)+(1/8-1/16)+……+1/64
= 1-1/64
=63/64
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