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2.1*12.5*4.8简便算

2.1×(12.5×4)×1.2=2.1×60=126

2.1乘以12.5乘以4.8 =2.1×12.5×(8×0.6) =(2.1×0.6)×(12.5×8) =1.26×100 =126

2.1×12.5×4.8 =(2.1×6)×(12.5×0.8) =12.6×10 =126 你好,本题已解答,如果满意,请点右上或下角“采纳答案”,支持一下。

=1.2×(4.8+5) =1.2×9.8 =1.2×(10-0.2) =12-0.24 =11.76 确定

1.2+8.8×12.5 =1.2+8x12.5+0.8x12.5 =1.2+100+10 =111.2

(1) 5 12 × 2 5 + 4 5 ÷ 12 5 ,= 5 12 × 2 5 + 4 5 × 5 12 ,= 5 12 × ( 2 5 + 4 5 ),= 5 12 × 6 5 ,= 1 2 ;(2)46.5-3.6-6.4+3.5,=(46.5+3.5)-(3.6+6.4),=50-10,=40;

=12×1/2+12×2/3+12×3/4-12×5/6 =6+8+9-10 =13

2.5×4.8 =2.5×4×1.2 =10×1.2 =12, 2.5×4.8 =5×0.5×4×4×0.3 =(5×4)×(0.5×4)×0.3 =20×2×0.3 =12, 2.5×4.8 =(2.5×4)×(4.8÷4) =10×1.2 =12。

这道题怎么算都不简便 1.25×2.5×12.5 =﹙1.25÷0.4﹚×﹙2.5×0.4﹚×12.5 =3.125×1×12.5 =﹙3.125÷8﹚×﹙12.5×8﹚ =0.390625×100 =39.0625

=(3/4-5/12)×3/2=3/4×3/2-5/12×3/2=1/2-5/8=-1/8

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