神机妙算细又巧(能简算的要写出简算过程)①0.65× 14+87×65%- 13 20 ② ( 2 3 -
神机妙算细又巧(能简算的要写出简算过程)①0.65×14+87×65%-1320②(23-12+16)÷124③76×(123-153)+23×(153+176)-53×...
神机妙算细又巧(能简算的要写出简算过程)①0.65× 14+87×65%- 13 20 ② ( 2 3 - 1 2 + 1 6 )÷ 1 24 ③ 76×( 1 23 - 1 53 ) +23× ( 1 53 + 1 76 )-53×( 1 23 - 1 76 ) .
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推荐于2016-06-11
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①0.65× 14+87×65%- =0.65×14+87×0.65-0.65, =0.65×(14+87-1), =0.65×100, =65;
② ( - + )÷ =( - + )×24, = ×24- ×24+ ×24, =16-12+4, =8;
③ 76×( - ) +23× ( + )-53×( - ) . =76× -76× +23× +23× -53× +53× , = - + + - + , =( - )+( + )-( - ), =1+1-1, =1. |
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