简便计算. ①111111÷1111×3333=_ ②6.25×0.16+2.64×0.0625+5.2×6.25=_ ③1/2-1/3+1/4-1/5+1/6-1/12=_.
问题描述:
简便计算.
①111111÷1111×3333=______
②6.25×0.16+2.64×0.0625+5.2×6.25=______
③
-1 2
+1 3
-1 4
+1 5
-1 6
=______. 1 12
答
①111111÷1111×3333,=111111×3333÷1111,=111111×(3333÷1111),=111111×3,=333333;②6.25×0.16+264×0.0625+5.2×6.25,=6.25×0.16+2.64×6.25+5.2×6.25,=6.25×(0.16+2.64+5.2),=6.25×8,=(6+...