543+545+547+549+551= × .
6.42×1.01﹣6.4280.7×8.7+8.07×13×153﹣0.6×53 23.19+2.4+2.91+14.62.6×99+2.624×(+) [×()].
能简便就简便. ①6.75﹣(+3.6) ②38×③3.28×0.75+1.72×④1.25×24×32.
递等式计算(能简算的要简算) ①(8.5﹣4)×10.32÷16②×(÷+)③42×101﹣42 ④(+﹣)×72⑤7.6﹣1.26﹣1.74⑥(4.2﹣3.52÷1.6)×1.5.
计算:能简算的要简算 (1)22.5×0.48+77.5×0.48(2) (3)(4) (5)1.25×32×0.25.
灵活计算.(能简便计算的要有简便方法计算) 1.2×0.5÷2.4÷+(+)×45+3.9++6.1.