计算下面各题,能简算的要简算.(1)25×32×1.25(2) 7 13 × 2 17 + 6
计算下面各题,能简算的要简算.(1)25×32×1.25(2)713×217+613÷172(3)23÷(1-58)(4)12+13-12+13(5)1.8×(5.7-3...
计算下面各题,能简算的要简算.(1)25×32×1.25(2) 7 13 × 2 17 + 6 13 ÷ 17 2 (3) 2 3 ÷(1- 5 8 )(4) 1 2 + 1 3 - 1 2 + 1 3 (5)1.8×(5.7-3.44÷0.8)(6)0.3×2÷0.3×2.
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(1)25×32×1.25, =25×4×8×1.25, =(25×4)×(8×1.25), =100×10, =1000;
(2) × + ÷ , = × + × , = ×( + ), = ×1, = ;
(3) ÷(1- ), = ÷ , = ;
(4) + - + , =( - )+( + ), =0+ , = ;
(5)1.8×(5.7-3.44÷0.8), =1.8×(5.7-4.3), =1.8×1.4, =2.52;
(6)0.3×2÷0.3×2, =(0.3÷0.3)×(2×2), =1×4, =4. |
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