能简算的要简算.3.2×1.25×0.255.8×[1÷(2.1-2.09)]3150×101-315042÷(12+23)34×78+18×75%(78-516)×(59+23)-数学
题文
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答案
3.2×1.25×0.25, =(0.8×1.25)×(4×0.25), =1×1, =1; 5.8×[1÷(2.1-2.09)], =5.8×[1÷0.01], =5.8×100, =580;
=
=
=62; 42÷(
=42÷
=42×
=36;
=0.75×(
=0.75×1, =0.75; (
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