脱式计算,能简算的要简便.7.8×5.6+2.3×4.4 0.73×101 0.25×9.87×4 76.3×27-76
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(5.5+2.3)×5.6+源凯2.3×4.4 =5.5×5.6+2.3×(5.6+4.4)=30.8+23=53.8
0.73×101 = 0.73×(100+1 )= 0.73×100+0.73×1 =73+0.73=73.73
0.25×9.87×4 = (0.25×4 ) ×9.87=9.87
76.3×27-棚兆76.3×17= 76.3×(链裂租27-17)= 76.3×10=763
0.73×101 = 0.73×(100+1 )= 0.73×100+0.73×1 =73+0.73=73.73
0.25×9.87×4 = (0.25×4 ) ×9.87=9.87
76.3×27-棚兆76.3×17= 76.3×(链裂租27-17)= 76.3×10=763
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