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25x18x32x计算225脱式

解:32X18一18X18 =18X(32一18) =18X(14十18一18) =18X14 =(20一2)X14 =280一28 =252十28一28 =252

234/(3X3)=234/9=26

原式=32x2+32x12 =32x(2+12) =32x14 =(30+2)x14 =30x14+2x14 =420+28 =448

32x2.5x1.25脱式计算 =8x4x2.5x1.25 =(8x1.25)x(4x2.5) =10x10 =100

32X18一28x11 =576-308 =268

(8×4)×125×25 =4×25×8×125 =100×1000 =100000

32x68+68x68 =(32+68)x68 =100x68 =6800

=278×(67+32+1) =278×100 =27800

900÷(18+60÷5) =900÷(18+12) =900÷30 =30, ———— 2240÷56+31-28 =40+31-28 =43, ———— 32×(284-179)-1400 =32×105-1400 =3360-1400 =1960

480+32x|4-280的脱式计算 480+32x|4-280 =480-280+448 =200+448 =648

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