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脱式计算.2.6×1.9÷2.6×1.94.264÷(0.16×20.5)12×...

(1)2.6×1.9÷2.6×1.9=(2.6÷2.6)×(1.9×1.9)=1×3.61=3.61(2)4.264÷(0.16×20.5)=4.264÷3.28=1.3(3)12×2.5+0.8×2.5=3×(4×2.5)+0.8×2.5=3×10+0.8×2.5=30+2=32(4)3.75÷0.25÷0.4=3.75÷(0.25×0.4)=3.75÷0.1=37.5(5)30-[5.5+18÷(5.2+...

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