Question

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三道递等式计算,能简则简 (1.85×1.7+1.7×8.5)÷8.5 7.6×2.2+2.2×3.4-22÷10 2.5×12.5×3.2

Answer 1

解：﹙1.85×1.7＋1.7×8.5﹚÷8.5
＝﹙1.85＋8.5﹚×1.7÷8.5
＝2.7÷5
＝0.54
7.6×2.2＋2.2×3.4－22÷10
＝7.6×2.2＋2.2×3.4－2.2
＝2.2×﹙7.6＋3.4－1﹚
＝22
2.5×12.5×3.2
＝2.5×0.4×8×12.5
＝1×100
＝100

Answer 2

1：原式=(1.7x1.85x2/17)+(1.7x8.5x2/17)=0.37+1.7=2.07
2：原式=2.2x(7.6+3.4-1/10)=2.2x10.9=1199/50
3：原式=2.5x12.5x4x0.8=(2.5x4)x(12.5x0.8)=10x10=100