脱式计算,能简算的要简算.①0.25× 75 31 + 49 31 ×25%② 7 10 ÷
脱式计算,能简算的要简算.①0.25×7531+4931×25%②710÷(1-34×25)③(84%÷3+8.72)×(1-19)④12×(12-34)...
脱式计算,能简算的要简算.①0.25× 75 31 + 49 31 ×25%② 7 10 ÷(1- 3 4 × 2 5 )③(84%÷3+8.72)×(1- 1 9 )④12×( 1 2 - 3 4 )
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①0.25×
=
=
=
=1; ②
=
=
=1; ③(84%÷3+8.72)×(1-
=(0.84÷3+8.72)×
=(0.28+8.72)×
=9×
=9; ④12×(
=12×
=6-9 =-3. |
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