Question

999.9×2.8-0.666×3700怎么简便计算？

Answer 1

999.9×2.8-0.666×3700
=（999+0.9）*2.8-666*3.7
=999*2.8+0.9*2.8-666*3.7
=333*3*2.8-333*2*3.7+2.52
=333*（3*2.8-2*3.7）+2.52
=333*（8.4-7.4）+2.52
=333*1+2.52
=335.52

Answer 2

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 3

999.9*2.8-0.666*3700
=999.9*2.8-666*3.7
=999*2.8-666*2.8-666*0.9+0.9*2.8
=333*2.8-666+66.6+2.8-0.28
=111*8.4-600+0.6+2.52
=840+84+8.4-600+3.12
=240+92.4+3.12
=240+95.52
=335.52