要求写出必要的解题过程(1)5.35×0.25+2.65× 1 4 (2) [(1- 1 2 )(1- 1 3
要求写出必要的解题过程(1)5.35×0.25+2.65×14(2)[(1-12)(1-13)(1-14)]÷(0.1+0.2+0.3)(3)9910+99910+999...
要求写出必要的解题过程(1)5.35×0.25+2.65× 1 4 (2) [(1- 1 2 )(1- 1 3 )(1- 1 4 )]÷(0.1+0.2+0.3) (3)9 9 10 +99 9 10 +999 9 10 +3× 1 10 (4)解方程:3x-0.8×75%=2.1.
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(1)5.35×0.25+2.65×
=5.35×0.25+2.65×0.25, =(5.35+2.65)×0.25, =8×0.25, =2; (2) [(1-
=[
=
=
(3)9
=9.9+99.9+999.9+(0.1+0.1+0.1), =(9.9+0.1)+(99.9+0.1)+(999.9+0.1), =10+100+1000, =1110; (4)3x-0.8×75%=2.1, 3x-0.6=2.1, 3x-0.6+0.6=2.1+0.6, 3x=2.7, 3x÷3=2.7÷3, x=0.9. |
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