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| ①125×(8+0.8), =125×8+125×0.8, =1000+100, =1100; ②8.72-3.54-2.46, =8.72-(3.54+2.46), =8.72-6, =2.72; ③2.5×0.64×4, =2.5×4×0.64, =10×0.64, =6.4; ④350-0.6×50, =350-30, =320; ⑤72×102-2×72, =72×(102-2), =72×100, =7200; ⑥100.2-5+9.8, =100.2+9.8-5, =110-5, =105. |
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