1.4×2.5-1.95÷0.65 1.7×0.8×1.25 2.5×7.3+1.7×2.5+2.5 27×9.9 急

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/18 00:13:00

1.4×2.5-1.95÷0.65 1.7×0.8×1.25 2.5×7.3+1.7×2.5+2.5 27×9.9 急
1.4×2.5-1.95÷0.65 1.7×0.8×1.25 2.5×7.3+1.7×2.5+2.5 27×9.9

1.4×2.5-1.95÷0.65 1.7×0.8×1.25 2.5×7.3+1.7×2.5+2.5 27×9.9 急
1.4×2.5-1.95÷0.65
=(1+0.4)*2.5-1.95*100/65
=1*2.5+0.4*2.5+3
=2.5+1+3
=6.5
1.7×0.8×1.25
=1.7*(0.8*1.25)
=1.7*1
=1.7
2.5×7.3+1.7×2.5+2.5
=2.5*(7.3+1.7+1)
=2.5*10
=25
27×9.9
=27*(10-0.1)
=27*10-27*0.1
=270-2.7
=267.3

1.4×2.5-1.95÷0.65=0.7×(2×2.5)-(0.39×5)÷(0.13×5)=3.5-(0.39÷0.13)=0.5
1.7×0.8×1.25=1.7×(0.8×1.25)=1.7×1=1.7
2.5×7.3+1.7×2.5+2.5 =2.5×(7.3+1.7+1)=25
27×9.9=27×(10-0.1)=27×10-0.1×27=270-2.7=267.3