递等式计算(能简算的要简算).(1)2.5×0.8×0.4×12.5(2)6.3×9.9(3)3.93×9.8+0.2×3.93(4)30
递等式计算(能简算的要简算).(1)2.5×0.8×0.4×12.5(2)6.3×9.9(3)3.93×9.8+0.2×3.93(4)300-(2.03+6.1)×30(...
递等式计算(能简算的要简算).(1)2.5×0.8×0.4×12.5(2)6.3×9.9(3)3.93×9.8+0.2×3.93(4)300-(2.03+6.1)×30(5)(1-0.2)×(3-2.32)÷0.01(6)8÷[(40.75-9.5)×0.4].
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(1)2.5×0.8×0.4×12.5, =(2.5×0.4)×(0.8×12.5), =1×10, =10; (2)6.3×9.9, =6.3×(10-0.1), =6.3×10-6.3×0.1, =63-0.63, =62.37; (3)3.93×9.8+0.2×3.93, =3.93×(9.8+0.2), =3.93×10, =39.3; (4)300-(2.03+6.1)×30, =300-8.13×30, =300-243.9, =56.1; (5)(1-0.2)×(3-2.32)÷0.01, =0.8×0.68÷0.01, =0.544÷0.01, =54.4; (6)8÷[(40.75-9.5)×0.4], =8÷[31.25×0.4], =8÷12.5, =0.64. |
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