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（1）2.5*32*0.125
=（2.5*4）*（8*0.125）
=10*1
=10
=3.5+6.5-7
=3
=2.5(1.2+0.8)
=25
=1.25(8.9-0.9)
=10
=12.5×0.8×7.4
=74
=6.5×（9.5+0.5）
=6.5×10
=65
=0.35*（1.6+3.4）
=0.35*5
=1.75
=6.75-（3.28+1.72）
=6.75-5
=1.75
=0.45+4.55+6.37
=5+6.37
=11.37
=（28-20）*12.5
=8*12.5
=100
=23.65-3.65-3.07
=20-3.07
=16.93
=（4+1）*7*10
=5*7*10
=350
=1.65*（99+1）
=1.65*100
=165
=27.85-7.85+3.4
=20+3.4
=23.4
7.8×9.9+0.78
=7.8*（9.9+0.1）
=7.8*10
=78
=（46+54）*4.8
=100*4.8
=480
=673-（327+173）
=673-500
=173
=1.11*（4*2.5）
=1.11*10
=11.1
=（3.5÷0.7）÷（1.4÷0.7）
=5÷2
=2.5
=（1+99）+（2+98）+（3+97）+.+（49+51）+50
=（100÷2-1）*100+50
=4900+50
=4950
=440.2+2.9,
=443.1；
=（4+0.2）×0.25,
=4×0.25+0.2×0.25,
=1+0.05,
=1.05；
=（5.2+0.8）×4.3,
=6×4.3,
=25.8．
=8.5+6×4,
=8.5+24,
=32.5．
=0.2+2.5%,
=0.225；
=4×8×125×2.5,
=8×125×（4×2.5）,
=1000×10,
=10000；
=94÷（58.14-57.2）,
=94÷0.94,
=100．
=13÷（0.4×2.5）,
=13÷1,
=13；
=（1.25×0.8）×2.5,
=1×2.5,
=2.5；
=1.5×（101-1）,
=1.5×100,
=150；
=4.8×100+4.8×1,
=480+4.8,
=484.8．
=15.275-7.8,
=7.475；
=0.57+0.1032,
=0.6732．
=189÷3,
=63；
=456÷2,
=228；
=516×6,
=3096．
=200+825,
=1025；
=51×48,
=2448．
=576-397,
=179；
=773-556,
=217．
=4.82-6.5×0.6,
=4.82-3.9,
=0.92．
（43）2.4/7 × 5/9 + 3/7 × 5/9 =(4/7+3/7)x5/9 =1x5/9 =5/9
（44）3.5/2 -（ 3/2 + 4/5 ） =5/2-3/2-4/5 =1-4/5 =1/5
（45）4.6 ×（ 1/2 + 2/3 ） =6x1/2+6x2/3 =3+4 =7
（46）5.8 × 4/5 + 8 × 11/5 =8x(4/5+11/5) =8x3 =24
（47）6.31 × 5/6 – 5/6 =(31-1)x5/6 =30x5/6 =25
（48）7.4/5 × 25/16 + 2/3 × 3/4 =5/4+1/2 =5/4+2/4 =7/4
（49）8.101 × 1/5 – 1/5 × 21 =(101-21)x1/5 =80x1/5 =16
（50）25×（2+4） =25×2+25×4 =50+100 =150
望采纳！
本文到此讲解完毕了，希望对大家有帮助。