脱式计算,能简算的要简算.(1)(25﹣0.2)÷(1÷0.25)(2)1.5×[4+15.6÷(1.65﹣0.35)](3)90.45﹣32.44﹣6.89×4 (4)1.2×6.08+3.92×(6÷5)
简算: 3.14×9919.25﹣0.47﹣8.531.25×0.03×8720÷45.
470÷2.5÷40.
0.8××1.25×4.
752×1.25+4.45×12.5+0.035×125.
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