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递等式计算50.4×1.9%1.

(1)50.4×1.9-1.9=50.4×1.9-1.9×1=(50.4-1)×1.9=49.4×1.9=93.86;(2)44.28÷0.9÷4.1=49.2÷4.1=12;(3)1.25×32×0.25=(1.25×8)×(4×0.25)=10×1=10;(4)8.6×9.9=8.6×(10-0.1)=8.6×10-8.6×0.1=86-0.86=85.14;(5)18÷2.5÷0.4=18÷(2....

原式=54.1×0.1+54.1×9.9 =54.1×10 =541

(3/4-1/16)×(1/9+1/3)用递等式计算 =(12/16-1/16)x(1/9+3/9) =11/16x4/9 =11/36

1.944\0.54*2.4=3.6*2.4=8.64

(1)0.034×0.5×0.6,=0.034×(0.5×0.6),=0.034×0.3,=0.0102;(2)50.4×1.9-1.8,=95.76-1.8,=93.96;(3)25.8+3.76×0.25,=25.8+3.76× 1 4 ,=25.8+0.94,=26.74;(4)102×0.45,=(100+2)×0.45,=100×0.45+2×0.45,=45+0.9,=45.9.

3.9+4.08+3.92+1.1递等式计算 =3.9+1.1+(4.08+3.92) =5+8 =13

3.9—4.1+6.1—5.9 =(6.1-4.1)+(3.9-5.9) =2-(5.9-3.9) =2-2 =0 方法2: 3.9-4.1+6.1-5.9 =(3.9+6.1)-(4.1+5.9) =10-10 =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....

1/5+4/5/5/9 =1/5+36/25 =5/25+36/25 =41/25

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