合理计算下面各题: 1.25×3.2×2.5 4.3÷0.4+2.5×5.7
合理计算下面各题:1.25×3.2×2.54.3÷0.4+2.5×5.70.36+9.28+0.64－1.2812.4÷4-1.313.5×0.6+4.753.84×9....
合理计算下面各题:
1.25×3.2×2.5
4.3÷0.4+2.5×5.7
0.36+9.28+0.64－1.28
12.4÷4- 1.3
13.5×0.6+4.75
3.84×9.9+0.384
急用!谢谢! 展开
1.25×3.2×2.5
4.3÷0.4+2.5×5.7
0.36+9.28+0.64－1.28
12.4÷4- 1.3
13.5×0.6+4.75
3.84×9.9+0.384
急用!谢谢! 展开
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1.25×3.2×2.5=1.25×8×0.4×2.5=10×1=10
4.3÷0.4+2.5×5.7=4.3×2.5+2.5×5.7=2.5×(4.3+5.7)=2.5×10=25
0.36+9.28+0.64－1.28=0.36+0.64+9.28-1.28=1+8=9
12.4÷4- 1.3=3.1-1.3=1.8
13.5×0.6+4.75=8.1+4.75=12.85
3.84×9.9+0.384=3.84×(10-0.1)+0.384=3.84×10-3.84×0.1+0.384=38.4-0.384+0.384=38.4
4.3÷0.4+2.5×5.7=4.3×2.5+2.5×5.7=2.5×(4.3+5.7)=2.5×10=25
0.36+9.28+0.64－1.28=0.36+0.64+9.28-1.28=1+8=9
12.4÷4- 1.3=3.1-1.3=1.8
13.5×0.6+4.75=8.1+4.75=12.85
3.84×9.9+0.384=3.84×(10-0.1)+0.384=3.84×10-3.84×0.1+0.384=38.4-0.384+0.384=38.4
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