2.8×4+7.2÷0.25=2.8×4+7.2÷1/4=2.8×4+7.2×4=(2.8+7.2)×4=10×4=40126.5÷0.25÷40=126.5÷(0.25×40)=126.5÷10=12.655.13×0.27+2.7×0.513=5.13×0.27+5.13×0.27=2×5.13×0.27=10.26×0.27=(10+0.2+0.06)...
2.8乘4加7.2除0.25和126.5除0.25除40还有5.13乘0.27加2.7乘0.513能简算要简算
2.8×4+7.2÷0.25=2.8×4+7.2÷1/4=2.8×4+7.2×4=(2.8+7.2)×4=10×4=40126.5÷0.25÷40=126.5÷(0.25×40)=126.5÷10=12.655.13×0.27+2.7×0.513=5.13×0.27+5.13×0.27=2×5.13×0.27=10.26×0.27=(10+0.2+0.06)...