问题
解答题
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答案
0.25×27×4,
=0.25×4×27, =1×27, =27; 45×36+64×45, =45×(36+64), =45×100, =4500; 1.25×320×25, =1.25×80×4×25, =(1.25×80)×(4×25), =100×100, =10000; 0.96×25, =0.24×4×25, =0.24×100, =24; 9.9×999+9.9, =9.9×(999+1), =9.9×1000, =9900; 1.08×125, =1×125+0.08×125, =125+10, =135; 8×25×1.25×16, =(8×1.25)×(25×4×4), =10×400, =4000; 489×101-489, =489×(101-1), =489×100, =48900; 33×1.03, =33×1+33×0.03, =33+0.99, =33.99; 28×45+30×13, =28×3×15+15×2×13, =15×(28×3+13×2), =15×(84+26), =15×110, =15×100+15×10, =1500+150, =1650; 5.6×9+56, =50.4+56, =106.4; 0.98×54, =(1-0.2)×54, =1×54-0.2×54, =54-10.8, =43.2. |