Question

999.9×2.8-0.666×3700怎样简便运算？

Answer 1

999.9×2.8-0.666×3700的的简便方法是什么？
999.9×2.8-0.666×3700
=999x2.8+0.9x2.8－666x3.7
=333x3x2.8-333x2x3.7+0.9x2.8

=333x(3x2.8－2x3.7)+(1－0.1)x2.8
=333x(8.4－7.4)+2.8－0.28
=333+2.8－0.28
=333+2.52

=335.52

Answer 2

999*2.8+0.9*2.8-0.666*3.7*1000
＝333*3*2.8-333*2*3.7+（1-0.1）*2.8
＝333*（8.4-7.4）+2.8-0.28
＝333+2.52
＝352.52