
(8.1-5.4)÷3.6+85.7怎样简便计算
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除法那部分先提取公因式
(8.1-5.4)÷3.6 = (0.9 x 9 - 0.9 x 6)÷ (0.9 x 4)= 0.9 x (9 - 6) ÷ (0.9 x 4)= 0.9 x (9 - 6) ÷ 0.9 ÷ 4= (9 - 6) ÷ 4= 0.75 (8.1-5.4)÷3.6+85.7= 0.75 + 85.7= 85 + 0.7 + 0.75= 85 + (0.7 + 0.75)= 85 + 1.45= 86.45
(8.1-5.4)÷3.6 = (0.9 x 9 - 0.9 x 6)÷ (0.9 x 4)= 0.9 x (9 - 6) ÷ (0.9 x 4)= 0.9 x (9 - 6) ÷ 0.9 ÷ 4= (9 - 6) ÷ 4= 0.75 (8.1-5.4)÷3.6+85.7= 0.75 + 85.7= 85 + 0.7 + 0.75= 85 + (0.7 + 0.75)= 85 + 1.45= 86.45
追答
除法那部分先提取公因式
(8.1-5.4)÷3.6
= (0.9 x 9 - 0.9 x 6)÷ (0.9 x 4)
= 0.9 x (9 - 6) ÷ (0.9 x 4)
= 0.9 x (9 - 6) ÷ 0.9 ÷ 4
= (9 - 6) ÷ 4
= 0.75
(8.1-5.4)÷3.6+85.7
= 0.75 + 85.7
= 85 + 0.7 + 0.75
= 85 + (0.7 + 0.75)
= 85 + 1.45
= 86.45
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