25×上七点五再乘一点六
25×上七点五再乘一点六
解:原式=25x7.5x1.6
=25x7.5x(0.4x4)
=(25x0.4)x(7.5x0.4)
=10x30
=300
分析:主要考察拆分法和结合律的运用。
一点六的七点五倍×1点二五的结果是多少
解:1.6x7.5x1.25
=0.2x8x7.5x1.25
=0.2x7.5x1.25x8
=1.5x10
=15
答:结果是15。
十八点零九减去七点五乘以0.14加上一点六的和简便计算
18.09-(7.5×0.14+1.6)
=18.09-(2.5×3×0.4×0.32+1.6)
=18.09-(3×0.32+1.6)
=18.09-(0.96+1.6)
=18.09-2.56
=15.53
十二点八乘七点五减一点二八乘25怎么巧算
=12.8×7.5-12.8×2.5
=12.8×(7.5-2.5)
=12.8×5
=64
七点五乘46点七教5.23乘75加七点五的简便运算
7.5×46.7+5.23×75
=7.5×10×4.67+75×5.23
=75×4.67+75×5.23
=75×(4.67+5.23)
=75×9.9
=75×(10-0.1)
=75×10-75×0.1
=750-7.5
=742.5
七点5×25加七点5×75减七点五巧算
7.5×25+7.5×75-7.5
=7.5×(25+75)-7.5
=7.5×100-7.5
=750-7.5
=742.5
七点三二乘一点六七怎样列竖式
7.32×1.67=12.2244
7.32
× 1.67
——————
5124
4392
732
——————
12.2244
七点五乘三又五分之四加起点二乘七点五减七点五怎么做过程
七点五乘三又五分之四加起点二乘七点五减七点五
=七点五乘(三又五分之四加七点二乘七点五减1)
=7.5×10
=75
五点七点五点七乘0.99简算
5.7X0.99
=5.7X(1一0.01)
=5.7X1一5.7X0.01
=5.7一0.057
=5.643
用简便计算,算五乘25加七点五乘75减7.5
5X25+7.5X75-7.5
=5X25+7.5X(75-1)
=5X25+75X7.4
=5X25+3X25X7.4
=25X(5+22.2)
=25X27.2
=25X28-25X0.8
=25X4X7-20
=700-20
=680