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急急急,2.4x0.19+0.24x8.1简便运算脱式计算怎么...

=2.4×0.19+2.4×0.81 =2.4×(0.19+0.81) =2.4×1 =2.4

见图

原式 =(1.08÷0.27)x0.8 =4x0.8 =3.2

80/72

10.1*8-0.8 =10.1*8-0.1*8 =(10.1-0.1)*8 =10*8 =80

0.8×1.2÷0.8×1.2 =(0.8÷0.8)×(1.2×1.2) =1×1.44 =1.44

(1.25十1.2)x8 =1.25×8+1.2×8 =10+9.6 =19.6

1.08x0.8÷0.27 =0.864÷0.27 =3.2

①0.24+1.33-0.63,=1.57-0.63,=0.94,②2.58-(3.5-2.4),=2.58-1.1,=1.48;③19.92-14.4-0.92,=19.92-0.92-14.4,=19-14.4,=4.6;④54÷(3.94+6.86),=54÷10.8,=5;⑤3.6÷0.4-1.2×5,=9-6,=3;⑥3.4×7.8÷3.9,=26.52÷3.9,=6.8.

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