脱式计算,能简算的简算. 4.2-1.38+5.8-3.62  
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脱式计算,能简算的简算.
4.2-1.38+5.8-3.62 |
(1)4.2-1.38+5.8-3.62
=(4.2+5.8)-(1.38+3.62), =10-5, =5; (2) 1 6÷[1÷( 3 5- 3 10)] = 1 6÷[1÷ 3 10], = 1 6÷ 10 3, = 1 20; (3)2÷ 2 3- 2 3÷2 =3- 1 3, =2 2 3. (4) 3 5×99+ 3 5 =(99+1)× 3 5, =100× 3 5, =60. |