250×4=, 254, 246, 62...2, 100, 1000, 12+B=50×2 B=?, 98, 88, 78, 6.251___6.24, =, <, >, 52.562___52.662, <, =, >, 58+3-18×4÷8=, 52, 21.5, 21, 22, 56+79×28-(56÷2)=, 3780, 1862, 2204, 3752, 3696.

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