脱式计算(能简算的要简算)1.25×0.25×3.2×1.71.3-3.79+
脱式计算(能简算的要简算)1.25×0.25×3.2×1.71.3-3.79+9.7-6.216×14+13÷4-11×25%...
脱式计算(能简算的要简算)1.25×0.25×3.2×1.71.3-3.79+9.7-6.216× 1 4 +13÷4-11×25%
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(1)1.25×0.25×3.2×1.7, =1.25×0.25×(0.8×4)×1.7, =(1.25×0.8)×(0.25×4)×1.7, =1×1×1.7, =1.7; (2)1.3-3.79+9.7-6.21, =1.3+9.7-3.79-6.21, =(1.3+9.7)-(3.79+6.21), =11-10, =1; (3)6×
=6×
=(6+13-11)×
=8×
=2. |
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