简便运算(1))99.99X0.8+11.11X2.8(2))9.99x2.22+3.33x3.34
问题描述:
简便运算(1))99.99X0.8+11.11X2.8(2))9.99x2.22+3.33x3.34
答
(1)99.99X0.8+11.11X2.8=99.99X0.8+11.11X2+11.11X0.8
=(99.99+11.11)X0.8+11.11X2
=111.1X0.8+22.22
=88.88+22.22
=22.22X(4+1)
=22.22X5
=111.1.
(2) 9.99X2.22+3.33X3.34=9.99X2.22+3.33X3+3.33X0.34
=9.99X(2.22+1)+3.33X0.34
=9.99X3.22+3.33X0.34
=3.33X(9.66+0.34)
=0.33X10
=3.3.