www.fltk.net > 7.8*0.37+0.78*6.3怎么巧算

7.8*0.37+0.78*6.3怎么巧算

7.8×0.37+0.78×6.3 =7.8×0.37+7.8×0.63 =7.8×(0.37+0.63) =7.8×1 =7.8

7.8×0.37 +0.78×6.3巧算 =7.8×(0.37+0.63) =7.8×1 =7.8

0.78×0.7÷0.39 =0.78÷0.39×0.7 =2×0.7 =1.4

7.8÷0.26-0.78÷2.6 =30-0.3 =29.7

0.78×1.5+0.78×6.34 =0.78×(1.5+6.34) =0.78×7.84 =6.1152

0.99×78+0.78 =0.99×78+0.01×78 =(0.99+0.01)×78 =1×78 =78

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