脱式计算,能简算的要简算.21÷0.25÷0.43.5×0.7+5.5×0.7+0.7
脱式计算,能简算的要简算.21÷0.25÷0.43.5×0.7+5.5×0.7+0.70.125×3.2×0.250.2×9.9+0.1....
脱式计算,能简算的要简算.21÷0.25÷0.43.5×0.7+5.5×0.7+0.70.125×3.2×0.250.2×9.9+0.1.
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(1)21÷0.25÷0.4, =21÷(0.25×0.4), =21÷0.1, =210; (2)3.5×0.7+5.5×0.7+0.7, =(3.5+5.5+1)×0.7, =10×0.7, =7; (3)0.125×3.2×0.25, =0.125×8×0.4×0.25, =(0.125×8)×(0.4×0.25), =1×0.1, =0.1; (4)0.2×9.9+0.1, =0.2×(10-0.1)+0.1, =0.2×10-0.2×0.1+0.1, =2+0.1-0.02, =2.1-0.02, =2.08. |
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