586×124+29×586-586×5321×(37+13+421+514)28×5+2×4×35+21×20+14×40+8×62512+135+338+216+625+413+58.-数学
题文
|
答案
(1)586×124+29×586-586×53, =(124+29-53)×586, =100×586, =58600; (2)21×(
=21×
=9+7+4+10, =16+4+10, =30; (3)28×5+2×4×35+21×20+14×40+8×62, =28×5+2×4×7×5+3×7×4×5+14×2×20+8×62, =28×5+28×10+28×15+28×20+8×62, =28×(5+10+15+20)+8×62, =28×50+8×62, =1400+496, =1896; (4)5
=(5
|