简便计算.①(7.5+2.5)/0.25 ②210—18*4 ③5.4/18+12 ④2除以5分之8*24分之25 ⑤2.25*1.8+1.25*0.28

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简便计算.①(7.5+2.5)/0.25 ②210—18*4 ③5.4/18+12 ④2除以5分之8*24分之25 ⑤2.25*1.8+1.25*0.28
简便计算.①(7.5+2.5)/0.25 ②210—18*4 ③5.4/18+12 ④2除以5分之8*24分之25 ⑤2.25*1.8+1.25*0.28

简便计算.①(7.5+2.5)/0.25 ②210—18*4 ③5.4/18+12 ④2除以5分之8*24分之25 ⑤2.25*1.8+1.25*0.28

(7.5+2.5)/0.25
= 10/0.25
= 40

210 - 18*4
= 210-72
= 138

5.4/18+12
= 0.3+12
= 12.3

2 / [8/5 * 25/24]
= 2 / (5/3)
= 6/5

2.25*1.8+1.25*0.28
= 2.25*(2-0.2) + 1.25*(0.2+0.08)
= 4.5 - 0.45 + 0.25 + 0.1
= 4.5 - 0.2 + 0.1
= 4.4