脱式计算(能简算的要用简算)12.5×0.4×2.5×89.5×10143.2-1.8
脱式计算(能简算的要用简算)12.5×0.4×2.5×89.5×10143.2-1.8×3-4.64.2×7.8+2.2×4.20.87×3.16+4.6412.5×4....
脱式计算(能简算的要用简算)12.5×0.4×2.5×89.5×10143.2-1.8×3-4.64.2×7.8+2.2×4.20.87×3.16+4.6412.5×4.8.
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①12.5×0.4×2.5×8
=(12.5×8)×(0.4×2.5)
=100×1
=100
②9.5×101
=9.5×(100+1)
=9.5×100+9.5
=959.5
③43.2-1.8×3-4.6
=43.2-5.4-4.6
=43.2-(5.4+4.6)
=33.2
④4.2×7.8+2.2×4.2
=4.2×(7.8+2.2)
=4.2×10
=42
⑤0.87×3.16+4.64
=2.7492+4.64
=7.3892
⑥12.5×4.8
=12.5×(4+0.8)
=12.5×4+12.5×0.8
=50+10
=60
=(12.5×8)×(0.4×2.5)
=100×1
=100
②9.5×101
=9.5×(100+1)
=9.5×100+9.5
=959.5
③43.2-1.8×3-4.6
=43.2-5.4-4.6
=43.2-(5.4+4.6)
=33.2
④4.2×7.8+2.2×4.2
=4.2×(7.8+2.2)
=4.2×10
=42
⑤0.87×3.16+4.64
=2.7492+4.64
=7.3892
⑥12.5×4.8
=12.5×(4+0.8)
=12.5×4+12.5×0.8
=50+10
=60
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