
143÷70估算
估算.143÷70≈632÷89≈425×294≈240÷77≈39×102≈205×49≈...
估算. 143÷70≈ 632÷89≈ 425×294≈ 240÷77≈ 39×102≈ 205×49≈
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143÷70,
≈140÷70,
=20;
632÷89,
≈630÷90,
=7;
425×294,
≈400×300,
=120000;
240÷77,
≈240÷80,
=3;
39×102,
≈40×100,
=4000;
205×49,
≈200×50,
=10000.
≈140÷70,
=20;
632÷89,
≈630÷90,
=7;
425×294,
≈400×300,
=120000;
240÷77,
≈240÷80,
=3;
39×102,
≈40×100,
=4000;
205×49,
≈200×50,
=10000.
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