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用递等式计算.(写出必要的计算过程,能简便计算...

(1)2.8×7.6+1.4×2.8+2.8=2.8×(7.6+1.4+1)=2.8×10=28;(2)70.8-0.8×0.5=70.8-0.4=70.4;(3)13-3.79-6.21=13-(3.79+6.21)=13-10=3;(4)5×(40+0.7)=5×40+5×0.7=200+3.5=203.5;(5)4.12-1.78-1.22=4.12-(1.78+1.22)=4.12-3=1.12;...

(1)28×105+7236÷18=2940+402=3342(2)4.5-3.15+0.5×8=4.5-3.15+4=5.35(3)8.5×5.3+3.7×8.5+8.5=8.5×(5.3+3.7+1)=8.5×10=85(4)(0.7+1.7)×15-36=2.4×15-36=36-36=0

(1)7.9×12.5,=(8-0.1)×12.5,=8×12.5-1×12.5,=100-12.5,=87.5;(2)25.38-1.43-4.38-4.57,=25.38-4.38-1.43-4.57,=(25.38-4.38)-(1.43-4.57),=21-6,=15;(3)90+10÷0.4×2.5,=90+25×2.5,=90+62.5,=152.5;(4)0.8×0.4×(7....

1)999+2+99+9+9999+2,=999+99+9+9999+(2+2),=(1000-1)+(100-1)+(10-1)+(10000-1)+4,=11110-3+4,=11109;(2)6.9×4+310÷25,=27.6+12.4,=40;(3)(3.5+6.5-6.5+3.5)÷4×2.5,=(10-6.5+3.5)÷4×2.5,=7÷4×2.5,=1.75×2.5,=4....

12.5X1.6X2.5 =12.5XO.4X(4X2.5) =5x1O =5O 4O1X0.32 =400X0.32十O.32 =128+O.32 =128.32

5.5*8.2+1.8*5.5 =5.5*(8.2+1.8) =5.5*10 =55

①(9.4-5.8)×2.07,=3.6×2.07,=7.452;②12.54-4.56-3.44-1.54,=(12.54-1.54)-(4.56+3.44),=11-8,=3;③(9.36×5+9.36+9.36×2)×1.25,=9.36×(5+2+1)×1.25,=9.36×8×1.25,=9.36×(8×1.25),=93.6;④7.236÷0.18-14.3×0.02,=40.2-0.28...

①100-870÷29-88=100-30-88=-18②15÷7.5+4.6-6.6=2+4.6-6.6=6.6-6.6=0③3.5×64×12.5=(3.5×8)×(8×12.5)=28×100=2800④51×7.5-49×7.5-1=(51-49)×7.5-1=2×7.5-1=15-1=14⑤4×(4.8+3.2÷4-5.6)=4×(4.8+0.8-5.6)=4×0=0⑥[8+(5-2)÷1.2]×5=[8+3÷1.2...

(1)45.07+(4.93+8.62),=45.07+13.55,=58.62;(2)12.5×(80+0.8),=12.5×80+12.5×0.8,=1000+10,=1010;(3)34.26+47.7-55.3+2.53,=34.26+(47.7+2.53)-55.3,=34.26+50.23-55.3,=84.49-55.3,=29.19;(4)13.2-180÷45×2.6,=13.2...

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