0.75×8.4+2.6×0.75-1.5×4
1个回答
关注
展开全部
0.75×8.4+2.6×0.75-1.5×4=0.75×8.4+2.6×0.75-0.75×8=0.75×(8.4+2.6-8)=0.75×3=2.25
咨询记录 · 回答于2022-12-12
0.75×8.4+2.6×0.75-1.5×4
0.75×8.4+2.6×0.75-1.5×4=0.75×8.4+2.6×0.75-0.75×8=0.75×(8.4+2.6-8)=0.75×3=2.25
0.81×0.125简便计算
=(0.8+0.01)×0.125=0.8×0.125+0.01×0.125=0.1+0.0125=0.1125
【1.4+(16.9-0.87÷2.9)】÷1.2-1.2
这个题一看就不可能简便
只能脱式计算
【1.4+(16.9-0.87÷2.9)】÷1.2-1.2=【1.4+(16.9-0.3)】÷1.2-1.2=(1.4+16.6)÷1.2-1.2=18÷1.2-1.2=15-1.2=13.8
X-1.24=0.3x解方程
X-1.24=0.3xx-0.3x=1.240.7x=1.24x=1.24÷0.7x=
除不尽