数学门诊.(把不对的改正过来)(1)1.7×0.31+0.69×1.7=1.7×(0.31+0.69)×1.7=1.7×1×1.7=2.89___
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解决时间 2021-03-05 10:04
- 提问者网友:且恨且铭记
- 2021-03-04 20:03
数学门诊.(把不对的改正过来)(1)1.7×0.31+0.69×1.7=1.7×(0.31+0.69)×1.7=1.7×1×1.7=2.89___
最佳答案
- 五星知识达人网友:爱难随人意
- 2021-03-04 20:48
(1)1.7×0.31+0.69×1.7 =1.7×(0.31+0.69)×1.7 =1.7×1×1.7 =2.89× 改正:1.7×0.31+0.69×1.7 =1.7×(0.31+0.69) =1.7×1, =1.7; (2)0.25×12 =0.25×(4×3) =0.25×4+0.25×3 =1+0.75 =1.75× 改正:0.25×12 =0.25×(4×3) =(0.25×4)×3 =1×3, =3; (3)3.5×103 =3.5×100+3 =350+3 =353× 改正:3.5×103 =3.5×(100+3) =3.5×100+3.5×3 =3500+10.5, =3510.5. 故答案为:×,×,×. |
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