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(8+0.4)×0.25脱式计算

(8+0.4)×0.25 =8×0.25+0.4×0.25 =2+0.1 =2.1

(1)0.8×0.25×4×0.5=(0.8×0.5)×(4×0.25)=0.4×1=0.4;(2)4.6×[3÷(1.45-1.05)]=4.6×[3÷0.4]=4.6×7.5=34.5;(3)55×9.9=55×(10-0.1)=55×10-55×0.1=550-5.5=544.5;(4)4.87×2.34+4.87×7.66=4.87×(2.34+7.66)=4.87×10=48.7.

4÷0.8-0.8÷4 =5-0.2 =4.8

=7.5×10×0.8 =75×0.8 =60

(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+...

(1)96÷(15.4-12.2),=96÷3.2,=30;(2)9÷[0.3×(8-6.5)],=9÷[0.3×1.5],=9÷0.45,=20;(3)0.175÷0.25÷0.4,=0.175÷(0.25×0.4),=0.175÷0.1,=1.75;(4)0.175÷0.25×4,=0.7×4,=2.8;(5)0.36÷[(6.1-4.6)×0.8],=0.36÷[1.5×0.8]...

1.25x(0.4+0.8) =1.25×0.4+1.25×0.8 =0.5+1 =1.5

题目

(1)3.09×99+3.09=3.09×(99+1)=3.09×100=309;(2)0.125×0.25×4×0.8=(0.125×0.8)×(0.25×4)=0.1×1=0.1;(3)1.25×7+1.25=1.25×(7+1)=1.25×8=10;(4)1.25×101=1.25×(100+1)=1.25×100+1.25=125+1.25=126.25.

(1)12.5×0.4×2.5×8,=(12.5×8)×(0.4×2.5),=100×1,=100;(2)0.87×6.6+8.7×0.34,=0.87×6.6+0.87×10×0.34,=0.87×6.6+0.87×3.4,=0.87×(6.6+3.4),=0.87×10,=8.7;(3)9.07-22.78÷3.4,=9.07-6.7,=2.37.

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