用递等式计算下列各题,能简算的要简算.①37×40+1035÷23②86.5×2.4÷0.3-690③2.8+[2.4÷(90-60)]
用递等式计算下列各题,能简算的要简算.①37×40+1035÷23②86.5×2.4÷0.3-690③2.8+[2.4÷(90-60)]④46.5×43.5+43.5×2...
用递等式计算下列各题,能简算的要简算.①37×40+1035÷23②86.5×2.4÷0.3-690③2.8+[2.4÷(90-60)]④46.5×43.5+43.5×27.5-25×43.5⑤ 8 21 × 3 4 + 7 12 × 4 7 ⑥0.4×7+ 2 5 ×3-0.4×3.
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①37×40+1035÷23, =1480+45, =1525; ②86.5×2.4÷0.3-690, =207.6÷0.3-690, =692-690, =2; ③2.8+[2.4÷(90-60)], =2.8+[2.4÷30], =2.8+0.08, =2.88; ④46.5×43.5+43.5×27.5-25×43.5, =(46.5+27.5-25)×43.5, =49×43.5, =2131.5; ⑤
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⑥0.4×7+
=0.4×7+0.4×3-0.4×3, =0.4×(7+3-3), =0.4×7, =2.8. |
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