5/7+19/25x4+21/25x19
2个回答
5/7+19/25x4+21/25x19
=5/7+4/25×19+21/25×19
=5/7+19×(4/25+21/25)
=5/7+19×1
=5/7+19
=19又5/7
相关问题
(7+19/25)*0.4+(7+19/25)*60%-0.4除3/5 简算
观察下列单项式:[1/3]x,-[3/5]x2,[5/7]x3,-[7/9]x4,…-[19/21]x19…
观察下列单项式:[1/3]x,-[3/5]x2,[5/7]x3,-[7/9]x4,…-[19/21]x19…
5+7-5+4-3+19-25+76
5(x-5.5)=20.5 2.4(6.4+x)=19.2. 25(x+
36.25-(19.8-7.25)-4.2
(25+23+()+20+19)÷5=21.6
解方程 19X/25-3X/5=3
3,4,7,12,19,( ),( ),25
一.25 15 520 14 828 21 二.① 7+77+777+.+7777777777=?② 19+199+19