小数简便运算的数学题我有7道不会的数学小数简便计算题!分别是：0.5×0.8×0.04×1.25×0.2×0.025/4.6×72×53÷4.6÷72÷53/5.6×16.5÷0.7÷1.1/152.3×4.8-4.8×31.15-4.8×21.15/2.4×7.6=6.5×7.6＋0.76＋7.6/6.3×27＋1.9×21/0.0495×2500＋495×0.24×51×4.95

（1）原式=（0.5×0.2）×（0.04×0.025）×（0.8×1.25）
=0.1×0.001×1
=0.0001
（2）原式=（4.6÷4.6）×（72÷72）×（53÷53）
=1×1×1
=1
（3）原式=（5.6÷0.7）×（16.5÷1.1）
=8×15
=120
（4）原式=（152.3-31.15-21.15）×4.8
=100×4.8
=480
（5）原式=2.4×7.6+6.5×7.6＋0.76＋7.6
=7.6×（2.4+6.5+0.1+1）
=7.6×10
=76
（6）原式=6.3×27＋1.9×21
=7×0.9×3×9+1.9×3×7
=(7×3)×(0.9×9+1.9)
=21×10
=210
（6）原式=0.0495×2500＋495×0.24+51×4.95
=495×（0.25+0.24+0.51）
=495×1
=495

0.5乘0.8乘0.04乘1.25乘0.2乘0.025
=（0.5乘0.2）乘（1.25乘0.8）乘（0.04乘0.025）
=1乘1乘1
=1

原式=(0.5×0.2)×(0.8×1.25)×(0.04×0.025)
=0.1×1×0.001
=0.0001
原式=(4.6÷4.6)×(72÷72)×(53÷53)
=1×1×1
=1
原式=（5.6÷0.7）×（16.5÷1.1）
=8×15
=120
原式=（152.3-31.15-21.15）×4.8
=100×4.8
=480
原式=2.4×7.6+6.5×7.6＋0.76＋7.6
=7.6×（2.4+6.5+0.1+1）
=7.6×10
=76
原式=6.3×27＋1.9×21
=7×0.9×3×9+1.9×3×7
=(7×3)×(0.9×9+1.9)
=21×10
=210
原式=0.0495×2500＋495×0.24+51×4.95
=495×（0.25+0.24+0.51）
=495×1
=495

第一题0.5×0.8×0.04×1.25×0.2×0.025=(0.5×0.2)×(0.8×1.25)×(0.04×0.025)=0.1×1×0.001=0.0001.
第二题4.6×72×53÷4.6÷72÷53=(4.6÷4.6)×(72÷72)×(53÷53)=1.
第三题5.6×16.5÷0.7÷1.1=(5.6÷0.7)×(16.5÷1.1)=8×15=120.
第四题152.3×4.8-4.8×31.15-4.8×21.15=4.8×(152.3-(31.15+21.15))=4.8×100=480.
第五题疑似2.4×7.6+6.5×7.6＋0.76＋7.6=7.6×(2.4+6.5+0.1+1)=7.6×10=76.
第六题疑似6.3×27＋0.9×21=63×2.7+21×0.9=(3×3+1)×21×0.9=10)×21×0.9=189.
第七题疑似0.0495×2500＋495×0.24+51×4.95=4.95×(25+24+51)=4.95×100=495

原式=(0.5×0.2)×(0.8×1.25)×(0.04×0.025)
=0.1×1×0.001
=0.0001
原式=(4.6÷4.6)×(72÷72)×(53÷53)
=1×1×1
=1
原式=（5.6÷0.7）×（16.5÷1.1）
=8×15
=120
原式=（152.3-31.15-21.15）×4.8
=100×4.8
=480
原式=2.4×7.6+6.5×7.6＋0.76＋7.6
=7.6×（2.4+6.5+0.1+1）
=7.6×10
=76
原式=6.3×27＋1.9×21
=7×0.9×3×9+1.9×3×7
=(7×3)×(0.9×9+1.9)
=21×10
=210
原式=0.0495×2500＋495×0.24+51×4.95
=495×（0.25+0.24+0.51）
=495×1
=495