谁会这三题脱式计算(能简算的要简算)①:1/3x5/12-1/3x1/4②:6/11x7/12-6/11x1/12③7/9÷2/7÷7/10.

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谁会这三题脱式计算(能简算的要简算)①:1/3x5/12-1/3x1/4②:6/11x7/12-6/11x1/12③7/9÷2/7÷7/10.

谁会这三题脱式计算(能简算的要简算)①:1/3x5/12-1/3x1/4②:6/11x7/12-6/11x1/12③7/9÷2/7÷7/10.
谁会这三题脱式计算(能简算的要简算)①:1/3x5/12-1/3x1/4②:6/11x7/12-6/11x1/12③7/9÷2/7÷7/10.

谁会这三题脱式计算(能简算的要简算)①:1/3x5/12-1/3x1/4②:6/11x7/12-6/11x1/12③7/9÷2/7÷7/10.
)①:1/3x5/12-1/3x1/4
=1/3x(5/12-1/4)
=1/3x1/6
=1/18
②:6/11x7/12-6/11x1/12
=6/11x(7/12-1/12)
=6/11x1/2
=3/11
③7/9÷2/7÷7/10
=7/9×7/2×10/7
=35/9