一个长方形菜地,长为18米,宽是15米.用菜地的种萝卜,萝卜种了多少平方米?
脱式计算,能简算的要简算. (1) (2)2.5×0.875+0.25×1.25 (3) (4).
脱式计算. ()×0.25[3.6﹣(1.6+)﹣]××[﹣(﹣0.25)](1+)×(1+)×(1+)×(1+)×(1+)
计算: ①+﹣=②3.2﹣0.85﹣1=③3.2×﹣÷2=④1.725×4×0.5= ⑤(+)÷=⑥1.8×0.72+1.28×1.8=⑦2÷(﹣)=⑧57.6÷[(1.25+25%)×0.32]=.
直接写得数. 3.86+2.4=7.6﹣0.56=4.5×102=3.25+2.3+1.75= 361+199=7÷0.4=4== 2.5×32==0.1÷0.01=3.47﹣(2.5+0.47)= 4768÷791≈12÷=1÷==5.58÷0.78≈ 4.98×7.11≈==
用你最喜欢的方法计算. 1.25×0.25×32 (0.25+)÷(﹣)×0.25+× [(8.7﹣7.5)÷0.2]×0.15 3.75×58.3÷58.3×6.54÷3.75÷65.4 56×(+﹣)