用递等式计算(能简算的要简算)20.9+10.5÷(5-3.5) 3.5×0.7+5.5×0.7+0.7 10.64+7.65×2.4+11.76
用递等式计算(能简算的要简算)20.9+10.5÷(5-3.5)3.5×0.7+5.5×0.7+0.710.64+7.65×2.4+11.766.2×9.99.83×(3...
用递等式计算(能简算的要简算)20.9+10.5÷(5-3.5) 3.5×0.7+5.5×0.7+0.7 10.64+7.65×2.4+11.76 6.2×9.9 9.83×(3.8-2.3)+1.5×6.17? 21÷0.25÷0.4.
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(1)20.9+10.5÷(5-3.5), =20.9+10.5÷1.5, =20.9+7, =27.9; (2)3.5×0.7+5.5×0.7+0.7, =(3.5+5.5+1)×0.7, =10×0.7, =7; (3)10.64+7.65×2.4+11.76, =10.64+18.36+11.76 =29+11.76, =40.76; (4)6.2×9.9, =6.2×(10-0.1), =6.2×10-6.2×0.1, =62-0.62, =61.38; (5)9.83×(3.8-2.3)+1.5×6.17, =9.83×1.5+1.5×6.17, =(9.83+6.17)×1.5, =16×1.5, =24; (6)21÷0.25÷0.4, =21÷(0.25×0.4), =21÷0.1, =210. |
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