脱式计算(能简算的要简算)0.75×4×0.25×4 9.6+9.9×99
脱式计算(能简算的要简算)0.75×4×0.25×49.6+9.9×996.3×10.115.58÷8.2-0.724.536÷0.8÷142.8×3.6+1.4×2.8...
脱式计算(能简算的要简算)0.75×4×0.25×4 9.6+9.9×99 6.3×10.1 15.58÷8.2-0.72 4.536÷0.8÷14 2.8×3.6+1.4×2.8.
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(1)0.75×4×0.25×4, =(0.75×4)×(0.25×4), =3×1, =3; (2)9.6+9.9×99, =(9.9-0.3)+9.9×99, =9.9+9.9×99-0.3, =9.9×(1+99)-0.3, =9.9×100-0.3, =990-0.3, =989.7; (3)6.3×10.1, =6.3×(10+0.1), =6.3×10+6.3×0.1, =63+0.63, =63.63; (4)15.58÷8.2-0.72, =1.9-0.72, =1.18; (5)4.536÷0.8÷14, =5.67÷14, =0.405; (6)2.8×3.6+1.4×2.8, =2.8×(3.6+1.4), =2.8×5, =14. |
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