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脱式计算能简算的要简算2.5×1.6×1.25

2.5✘1.6✘1.25 =5

1.6×2.5×7.5 =0.8x2x2.5x7.5 =0.8x2.5x(2x7.5) =2x15 =30 谢谢,请采纳

①1.25×4.8,=1.25×8×0.6,=10×0.6,=6; ②5.5×9.9+0.1×5.5,=(9.9+0.1)×5.5,=10×5.5,=55; ③3.45×102,=3.45×(100+2),=3.45×100+3.45×2,=345+6.9,=351.9;④3.17+0.83×1.6,=3.17+1.328,=4.498.

(1)13÷0.4÷2.5,=13÷(0.4×2.5),=13÷1,=13;(2)64×4.5+36×4.5,=(64+36)×4.5,=100×4.5,=450;(3)1.25×2.5×0.8,=1.25×0.8×2.5,=1×2.5,=2.5;(4)1.5×101-1.5,=1.5×(101-1),=1.5×100,=150;(5)14.64+3.7×2.8,=14.64+10....

(1)16-65+8.4-45,=16-1.2+8.4-0.8,=(16+8.4)-(1.2+0.8),=24.4-2,=22.4;(2)1.25×32×2.5,=1.25×8×4×2.5,=(1.25×8)×(4×2.5),=10×10,=100;(3)2345×19+23×2645,=2345×19+2345×26,=2345×(19+26),=2345×45,=23;(4)82×...

(1)2.5×1.37×0.4,=2.5×0.4×1.37,=1×1.37,=1.37;(2)4.8×0.25,=1.2×4×0.25,=1.2×(4×0.25),=1.2×1,=1.2;(3)0.89×4.8+0.89×5.2,=0.89×(4.8+5.2),=0.89×10,=8.9;(4)101×0.78,=(100+1)×0.78,=100×0.78+1×0.78,=78+0.78...

(1)25×7.6×0.8,=(25×0.8)×7.6,=20×7.6,=152;(2)23.7-3.9+6.3-6.1,=(23.7+6.3)-(3.9+6.1),=30-10,=20;(3)2.5×64×1.25,=2.5×(4×8×2)×1.25,=(2.5×4)×(1.25×8)×2,=10×10×2,=200;(4)1÷(1-0.98),=1÷0.02,=50;(...

1.25x3.2x2.5 =1.25×8×0.4×2.5 =10×1 =10

1.25×0.4×80×2.5 =(1.25×80)×(2.5×0.4) =100×1 =100

(1)4.5×5.2+4.5×4.8=4.5×(5.2+4.8)=4.5×10=45;(2)8.8×1.25=(8+0.8)×1.25=8×1.25+0.8×1.25=10+1=11;(3)0.4×(4.3×2.5)=4.3×(0.4×2.5)=4.3×1=4.3;(4)60.8-1.75-1.25=60.8-(1.75+1.25)=60.8-3=57.8;(5)0.4×(4.3×2.5)=4.3×...

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