问题补充:
根据运算定律,在里填上合适的数.
(1)6.1×4.5+3.9×4.5=(+3.9)×
(2)0.69×101=×+×
答案:
解:
(1)6.1×4.5+3.9×4.5,
=(6.1+3.9)×4.5,
=10×4.5,
=45;
(2)0.69×101,
=0.69×(100+1),
=0.69×100+0.69×1,
=69+0.69,
=69.69.
故
时间:2021-05-22 07:23:10
根据运算定律,在里填上合适的数.
(1)6.1×4.5+3.9×4.5=(+3.9)×
(2)0.69×101=×+×
解:
(1)6.1×4.5+3.9×4.5,
=(6.1+3.9)×4.5,
=10×4.5,
=45;
(2)0.69×101,
=0.69×(100+1),
=0.69×100+0.69×1,
=69+0.69,
=69.69.
故