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用递等式计算.①987+104×65-1747②86.4÷3.2-6.4×3.2③3763÷7+17×2663④17-16.8÷(1.8+7.2×112)⑤(79+421-37)×6.
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①987+104×65-1747, =987+(100+4)×65-1747, =987+6500+260-1747, =7747-1747, =6000; ②86.4÷3.2-6.4×3.2, =27-20.48, =6.52; ③
=
=
=
④17-16.8÷(1.8+7.2×
=17-16.8÷(1.8+0.6), =17-16.8÷2.4, =17-7, =10; ⑤(
=6.3×
=4.9+1.2-2.7, =3.4; ⑥15÷〔(
=15÷[(
=15÷[
=15÷[
=15÷2-0.5, =7.5-0.5, =7. |
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