怎样简便就怎样计算28.4×101-28.4 3.6×201 3.5×0.7+5.5×0.7+0.7 4×0.8×12.5×2.5 17.5÷0.25
怎样简便就怎样计算28.4×101-28.43.6×2013.5×0.7+5.5×0.7+0.74×0.8×12.5×2.517.5÷0.25×17+130.94×2.5...
怎样简便就怎样计算28.4×101-28.4 3.6×201 3.5×0.7+5.5×0.7+0.7 4×0.8×12.5×2.5 17.5÷0.25×17+13 0.94×2.5-0.45
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①28.4×101-28.4 =28.2×(100+1) =28.2×100+28.2×1 =2820+28.2 =2848.2; ②3.6×201 =3.6×(200+1) =3.6×200+3.6×1 =720+3.6 =723.6; ③3.5×0.7+5.5×0.7+0.7 =(3.5+5.5+1)×0.7 =10×0.7 =7; ④4×0.8×12.5×2.5 =(0.8×12.5)×(4×2.5) =10×10 =100; ⑤17.5÷0.25×17+13 =70×17+13 =1190+13 =1203; ⑥0.94×2.5-0.45 =2.35-0.45 =1.9. |
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