问题
解答题
简便运算我也行.
2.06×101
0.25×125×0.32
1.25×8.8
31.8×2.5+31.8×7.5.
答案
(1)2.06×101
=2.06×(100+1)
=2.06×100+2.06×1
=206+2.06
=208.06;
(2)0.25×125×0.32
=0.25×125×0.4×0.8
=(0.25×0.4)×(125×0.8)
=0.1×100
=10;
(3)1.25×8.8
=1.25×(8+0.8)
=1.25×8+1.25×0.8
=10+1
=11;
(4)31.8×2.5+31.8×7.5
=31.8×(2.5+7.5)
=31.8×10
=318.