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括号负三百七十乘括号负四分之一加零点二五乘二十...

负二百七十乘四分之一加零点二五乘二十一点五加负八又二分之一乘负四分之一 =-270×0.25+0.25×21.5+8.5×0.25 =0.25×(-270+21.5+8.5) =0.25×(-240) =-60

(负二分之一)乘四分之三加二分之五乘(负零点七五) =-1/2x3/4-5/2x3/4 =(-1/2-5/2)x3/4 =-3x3/4 =-9/4 =-2又1/4

发过去了,望采纳

2分之1÷(-4分之1)+1-0.2×5分之3×(-3) =2分之1×(-4)+1+5分之1×5分之3×3 =-2+1+25分之9 =-1+25分之9 =-25分之16 结果是-25分之16

0.7*(1+4/9)+(2+3/4)*15+0.7*5/9+1/4*15=0.7*(1+4/9+5/9)+(2+3/4+1/4)*15=0.7*2+3*15=46.4

1.8×1/4+7.2×25%+0.25 =1.8×0.25+7.2×0.25+0.25 =0.25×(1.8+7.2+1) =0.25×10 =2.5

解: 3.8×0.25 + 1/4 × 3又1/5 +0.25 =3.8×0.25 + 0.25×3.2 +0.25 =0.25×(3.8+3.2+1) =0.25 × 8 =2 满意请采纳。

(3又3/7+0.8+3/8)×1.25 =24/7×5/4+0.8×5/4+3/8×5/4 =4又2/7+1+15/32 =5又169/224

2/5÷(-2又2/5)-8/21×(-1又3/4)-0.75=2/5÷(-12/5)-8/21×(-7/4)-0.75=-1/6+2/3-3/4=1/2-3/4=-1/4

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